Update Travis

Author: kbiakov

.travis.yml

@@ -10,8 +10,8 @@ android:
  - tools # to get the new `repository-11.xml`
  - tools # to install latest Android SDK tools
  - platform-tools
- - build-tools-27.0.3
- - android-27
+ - build-tools-28.0.3
+ - android-28
  - extra-android-m2repository # Design Support library
  - android-21
  - sys-img-armeabi-v7a-android-21 # system image (emulator)
@@ -24,7 +24,7 @@ env:
 
 before_script:
  # Automatically accept all SDK licences
- - echo yes | android update sdk --no-ui --all --filter build-tools-27.0.3,android-27,extra-android-m2repository
+ - echo yes | android update sdk --no-ui --all --filter build-tools-28.0.3,android-28,extra-android-m2repository
  # Emulator Management: create, start & wait
  - echo no | android create avd --force -n test -t android-21 --abi armeabi-v7a
  - emulator -avd test -no-skin -no-audio -no-window &