Don't use Travis CI

.travis.yml

@@ -1,42 +0,0 @@
-dist: xenial
-sudo: false
-
-language: cpp
-
-cache: ccache
-
-addons:
-  apt:
-    sources:
-      - sourceline: 'deb http://packages.icinga.com/ubuntu icinga-xenial main'
-        key_url: 'https://packages.icinga.com/icinga.key'
-    packages:
-      - libboost1.67-icinga-all-dev
-      - flex
-      - bison
-      - libssl-dev
-      - libpq-dev
-      - libmysqlclient-dev
-      - libedit-dev
-before_script:
-  - arch=$(uname -m)
-  - mkdir build
-  - cd build
-  - >
-    cmake ..
-    -DCMAKE_BUILD_TYPE=Debug
-    -DICINGA2_UNITY_BUILD=Off
-    -DCMAKE_INSTALL_PREFIX=/tmp/icinga2
-    -DICINGA2_PLUGINDIR=/tmp/icinga2/sbin
-    -DBoost_NO_BOOST_CMAKE=TRUE
-    -DBoost_NO_SYSTEM_PATHS=TRUE
-    -DBOOST_LIBRARYDIR=/usr/lib/${arch}-linux-gnu/icinga-boost
-    -DBOOST_INCLUDEDIR=/usr/include/icinga-boost
-    -DCMAKE_INSTALL_RPATH=/usr/lib/${arch}-linux-gnu/icinga-boost
-
-script:
-  - make
-  - make test
-  - make install
-  - /tmp/icinga2/sbin/icinga2 --version
-  - /tmp/icinga2/sbin/icinga2 daemon -C -DRunAsUser=$(id -u -n) -DRunAsGroup=$(id -g -n)