chore: update .travis.yml to use sdk 29 and build-tools 29.0.0

Author: thatfiredev

.travis.yml

@@ -10,14 +10,14 @@ cache:
     - $HOME/.gradle/wrapper/
     - $HOME/.android/build-cache
 before_install:
-  - yes | sdkmanager "platforms;android-28"
+  - yes | sdkmanager "platforms;android-29"
   - mkdir "$ANDROID_HOME/licenses" || true
   - echo -e "\n8933bad161af4178b1185d1a37fbf41ea5269c55\nd56f5187479451eabf01fb78af6dfcb131a6481e" > "$ANDROID_HOME/licenses/android-sdk-license"
   - echo -e "\n84831b9409646a918e30573bab4c9c91346d8abd\n504667f4c0de7af1a06de9f4b1727b84351f2910" > "$ANDROID_HOME/licenses/android-sdk-preview-license"
 android:
   components:
     - tools
-    - build-tools-28.0.3
+    - build-tools-29.0.0
     - tools
   licenses:
     - android-sdk-preview-license-.+