Build Kotlin Multiplatform project on Travis CI

travis.yml

language: objective-c
osx_image: xcode9.4

before_cache:
- rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
- rm -fr $HOME/.gradle/caches/*/plugin-resolution/

cache:
- directories:
    # Android SDK
  - $HOME/android-sdk-dl
  - $HOME/android-sdk
    # Gradle dependencies
  - $HOME/.gradle/caches/
  - $HOME/.gradle/wrapper/
    # Android build cache (see http://tools.android.com/tech-docs/build-cache)
  - $HOME/.android/build-cache
  - $HOME/.konan/cache

env:
- ANDROID_HOME=$HOME/android-sdk JAVA_OPTS='-XX:+IgnoreUnrecognizedVMOptions --add-modules java.se.ee'

before_install:
- ./scripts/download_android_sdk_for_mac.sh

script:
- ./gradlew clean build