Update Build Tools

.travis.yml

@@ -4,7 +4,7 @@ android:
   components:
     - tools
     - platform-tools
-    - build-tools-28.0.1
+    - build-tools-28.0.2
     - android-28
     - extra-android-support
     - extra-android-m2repository

dependencies.gradle

@@ -1,7 +1,7 @@
 ext.versions = [
     minSdk            : 16,
     compileSdk        : 28,
-    buildTools        : '28.0.1',
+    buildTools        : '28.0.2',
     publishVersion    : '2.0.0-alpha04',
     publishVersionCode: 203,