Remove travis CI

.travis.yml

@@ -1,46 +0,0 @@
-language: android
-jdk: oraclejdk8
-dist: trusty
-
-# Install Android SDK
-android:
-  components:
-    - tools
-    - platform-tools
-    - build-tools-28.0.3
-    - android-28
-    - extra-android-m2repository
-
-# Install Android NDK (apparently there is no easier way to do this)
-# https://github.com/travis-ci/travis-ci/issues/5395
-before_script:
-  - export NDK_VERSION=r20
-  - curl -L https://dl.google.com/android/repository/android-ndk-${NDK_VERSION}-linux-x86_64.zip -O
-  - unzip -q android-ndk-${NDK_VERSION}-linux-x86_64.zip
-  - export ANDROID_NDK_HOME=`pwd`/android-ndk-${NDK_VERSION}
-
-before_install:
-  # Install Go using gimme tool
-  - curl -sL -o ~/bin/gimme https://raw.githubusercontent.com/travis-ci/gimme/master/gimme
-  - chmod +x ~/bin/gimme
-  - eval "$(gimme stable)"
-  # Hack to accept Android licenses
-  - yes | sdkmanager "platforms;android-28"
-  - yes | sdkmanager "platforms;android-29"
-
-# Cache gradle dependencies
-# https://docs.travis-ci.com/user/languages/android/#Caching
-before_cache:
-  - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
-  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
-cache:
-  directories:
-    - $HOME/.gradle/caches/
-    - $HOME/.gradle/wrapper/
-
-script:
-  - ./gradlew lint
-  - ./gradlew buildNative assembleDebug
-
-notifications:
-  email: false