remove travis ci config

.travis.yml

@@ -1,23 +0,0 @@
-language: python
-
-python:
-  - 3.4
-
-install:
-  - pip install PyYAML==5.1.2
-  - pip install mkdocs==0.16.3
-  - python setup.py install
-
-script:
-  - mkdocs build --clean
-
-after_success: |
-  if [ -n "$GITHUB_API_KEY" ]; then
-    cd "$TRAVIS_BUILD_DIR"
-    cd site
-    git init
-    git add .
-    git -c user.name=$GITHUB_MEOWJ_NAME -c user.email=$GITHUB_MEOWJ_EMAIL commit -m "Auto Deployment"
-    git push -f -q https://Krasjet:$GITHUB_API_KEY@github.com/LearnOpenGL-CN/learnopengl-cn.github.io master
-    cd "$TRAVIS_BUILD_DIR"
-  fi