Accept the updated Android Build-Tools 27 license

Author: jhansche

.travis.yml

@@ -12,6 +12,7 @@ before_install:
     - pip install --user codecov
     - mkdir "$ANDROID_HOME/licenses" || true
     - echo "d56f5187479451eabf01fb78af6dfcb131a6481e" > "$ANDROID_HOME/licenses/android-sdk-license"
+    - echo "24333f8a63b6825ea9c5514f83c2829b004d1fee" >> "$ANDROID_HOME/licenses/android-sdk-license"
 
 script:
   - ./gradlew clean testDebugUnitTest jacocoTestReport