ci: remove travis CI

We moved to Azure Pipelines.

Signed-off-by: Ran Benita <ran@unusedvar.com>

.travis.yml

@@ -1,32 +0,0 @@
-language: c
-
-matrix:
-  include:
-    - os: linux
-      dist: bionic
-      compiler: gcc
-      before_install:
-        - sudo apt-get -y install xutils-dev doxygen libxcb-xkb-dev valgrind meson libwayland-dev wayland-protocols
-      script:
-        - mkdir autotools-build && pushd autotools-build && ../autogen.sh && make && make check && popd
-        - meson setup meson-build && pushd meson-build && ninja && meson test --print-errorlogs --wrap='valgrind --leak-check=full --track-origins=yes --error-exitcode=99' && popd
-
-    - os: linux
-      dist: bionic
-      compiler: clang
-      before_install:
-        - sudo apt-get -y install xutils-dev doxygen libxcb-xkb-dev valgrind meson libwayland-dev wayland-protocols
-      script:
-        - mkdir autotools-build && pushd autotools-build && ../autogen.sh && make && make check && popd
-        - meson setup meson-build && pushd meson-build && ninja && meson test --print-errorlogs --wrap='valgrind --leak-check=full --track-origins=yes --error-exitcode=99' && popd
-
-    - os: osx
-      osx_image: xcode10.2
-      compiler: clang
-      before_install:
-        - HOMEBREW_NO_AUTO_UPDATE=1 HOMEBREW_NO_INSTALL_CLEANUP=1 brew install meson doxygen bison
-        - brew link bison --force
-      before_script:
-        - export PATH="/usr/local/opt/bison/bin:$PATH"
-      script:
-        - meson setup meson-build -Denable-x11=false -Denable-wayland=false && pushd meson-build && ninja && meson test --print-errorlogs && popd