remove travis

.travis.yml

@@ -1,31 +0,0 @@
-cache: ccache
-language: cpp
-matrix:
-  include:
-    - os: linux
-      dist: xenial
-      compiler: clang
-    - os: linux
-      dist: xenial
-      compiler: gcc
-    - os: osx
-      compiler: clang
-
-addons:
-  apt:
-    packages:
-    - cmake
-
-script:
-  # Output version info for compilers, cmake, and make
-  - ${CC} -v
-  - ${CXX} -v
-  - cmake --version
-  - make --version
-  # Clone googletest
-  - pushd .. && git clone https://github.com/google/googletest.git && popd
-  # Configure and build
-  - mkdir _travis_build && cd _travis_build
-  - cmake -G "Unix Makefiles" -DENABLE_TESTS=ON ..
-  - make -j10
-  - ./draco_tests