fix travis

Author: HITGIF

.travis.yml

@@ -9,6 +9,7 @@ android:
     - extra-android-m2repository
 before_install:
   - chmod +x gradlew
+  - yes | sdkmanager "platforms;android-27"
 before_cache:
   - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
   - rm -fr $HOME/.gradle/caches/*/plugin-resolution/