Update to build tools v29.0.2 (#2385)

.travis.yml

@@ -2,7 +2,7 @@ dist: trusty
 language: android
 android:
   components:
-  - build-tools-28.0.3
+  - build-tools-29.0.2
   - android-27
   - extra-android-m2repository
   - extra-google-m2repository

app/build.gradle

@@ -30,7 +30,7 @@ ext {
 
 android {
     compileSdkVersion 27
-    buildToolsVersion '28.0.3'
+    buildToolsVersion '29.0.2'
     publishNonDefault true
 
     defaultConfig {