Remove old installs and attempt at doc test fix

.github/workflows/.travis.yml

@@ -14,11 +14,7 @@ jobs:
             RUN_INTEGRATION_TESTS: ${{ matrix.test_number}}
         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"
-            - run: pip install "tox<=3.14.1"
-            - run: pip install "PyYAML<=5.2"
+            - run: pip install "tox"
             - run: pip install bandit
             - run: pip install codecov
             - run: pip install slugs

docs/source/conf.py

@@ -64,7 +64,7 @@ release = u'0.8.dev'
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = 'en'
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.