Remove android from Travis

.travis.yml

@@ -1,28 +1,13 @@
-language: android
+language: java
 jdk: oraclejdk8
 sudo: required
-before_install:
-- mkdir "$ANDROID_HOME/licenses" || true
-- echo -e "\n8933bad161af4178b1185d1a37fbf41ea5269c55" > "$ANDROID_HOME/licenses/android-sdk-license"
-- echo -e "\n84831b9409646a918e30573bab4c9c91346d8abd" > "$ANDROID_HOME/licenses/android-sdk-preview-license"
-android:
-  components:
-  - tools
-  - tools
-  - platform-tools
-  - android-27
-  - build-tools-27.0.2
 before_cache:
 - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
 - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
 cache:
   directories:
   - "$HOME/.gradle/caches/"
   - "$HOME/.gradle/wrapper/"
-  - "$HOME/.android/build-cache"
-before_script:
-- echo y | ${ANDROID_HOME}/tools/bin/sdkmanager --channel=3 "tools" "platform-tools"
-  "build-tools;27.0.2" "platforms;android-27" "extras;google;m2repository"
 script: "./build.sh"
 java/service-account:
   json: