diff --git a/.github/workflows/.travis.yml b/.github/workflows/.travis.yml
index 19718aa..457e73a 100644
--- a/.github/workflows/.travis.yml
+++ b/.github/workflows/.travis.yml
@@ -10,6 +10,7 @@ jobs:
     build-1:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -34,6 +35,7 @@ jobs:
     build-2:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -58,6 +60,7 @@ jobs:
     build-3:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -82,6 +85,7 @@ jobs:
     build-4:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -106,6 +110,7 @@ jobs:
     build-5:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -130,6 +135,7 @@ jobs:
     build-6:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -154,6 +160,7 @@ jobs:
     build-7:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -178,6 +185,7 @@ jobs:
     build-8:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -202,6 +210,7 @@ jobs:
     build-9:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -226,6 +235,7 @@ jobs:
     build-10:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -250,6 +260,7 @@ jobs:
     build-11:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -274,6 +285,7 @@ jobs:
     build-12:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -298,6 +310,7 @@ jobs:
     build-13:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -322,6 +335,7 @@ jobs:
     build-14:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -346,6 +360,7 @@ jobs:
     build-15:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -370,6 +385,7 @@ jobs:
     build-16:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -394,6 +410,7 @@ jobs:
     build-17:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -418,6 +435,7 @@ jobs:
     build-18:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -442,6 +460,7 @@ jobs:
     build-19:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -466,6 +485,7 @@ jobs:
     build-20:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -490,6 +510,7 @@ jobs:
     build-21:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -514,6 +535,7 @@ jobs:
     build-22:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -538,6 +560,7 @@ jobs:
     build-23:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -562,6 +585,7 @@ jobs:
     build-24:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -586,6 +610,7 @@ jobs:
     build-25:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -610,6 +635,7 @@ jobs:
     build-26:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -634,6 +660,7 @@ jobs:
     build-27:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -658,6 +685,7 @@ jobs:
     build-28:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -682,6 +710,7 @@ jobs:
     build-29:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -706,6 +735,7 @@ jobs:
     build-30:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -730,6 +760,7 @@ jobs:
     build-31:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -754,6 +785,7 @@ jobs:
     build-32:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -778,6 +810,7 @@ jobs:
     build-33:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -802,6 +835,7 @@ jobs:
     build-34:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -826,6 +860,7 @@ jobs:
     build-35:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -850,6 +885,7 @@ jobs:
     build-36:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -884,6 +920,7 @@ jobs:
     build-37:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -917,6 +954,7 @@ jobs:
     build-38:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -949,6 +987,7 @@ jobs:
     build-39:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -973,6 +1012,7 @@ jobs:
     build-40:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -997,6 +1037,7 @@ jobs:
     build-41:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -1021,6 +1062,7 @@ jobs:
     build-42:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -1045,6 +1087,7 @@ jobs:
     build-43:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -1069,6 +1112,7 @@ jobs:
     build-44:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -1093,6 +1137,7 @@ jobs:
     build-45:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -1117,6 +1162,7 @@ jobs:
     build-46:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -1141,6 +1187,7 @@ jobs:
     build-47:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"
@@ -1165,6 +1212,7 @@ jobs:
     build-48:
         runs-on: ubuntu-latest
         steps:
+            - uses: actions/checkout@v2
             - run: pip uninstall -y six
             - run: pip install six>=1.11.0
             - run: pip install "more_itertools<=7.2.0"