Fix Travis-CI license issue for android 27

Travis somehow doesn't accept license for android 27 and gives the following error. You have not accepted the license agreements of the following SDK components: [Android SDK Platform 27]. It seems the issue is related some checksum changes, therefore the fix is to enforce agreement.
liuxiaowei · Mar 13, 2018 · 787293b · 787293b
1 parent cecf475
commit 787293b
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/.travis.yml b/.travis.yml
@@ -8,5 +8,8 @@ android:
     - build-tools-27.0.3
     - android-27
 
+before_install:
+  - yes | sdkmanager "platforms;android-27"
+
 script:
 - ./gradlew check