Merge pull request #1057 from Doko-Demo-Doa/master

Bump Android version

android/build.gradle

 apply plugin: 'com.android.library'
 
-def DEFAULT_COMPILE_SDK_VERSION             = 27
-def DEFAULT_BUILD_TOOLS_VERSION             = "27.0.3"
-def DEFAULT_TARGET_SDK_VERSION              = 27
+def DEFAULT_COMPILE_SDK_VERSION             = 28
+def DEFAULT_BUILD_TOOLS_VERSION             = "28.0.2"
+def DEFAULT_TARGET_SDK_VERSION              = 28
 def DEFAULT_GOOGLE_PLAY_SERVICES_VERSION    = "+"
 def DEFAULT_FIREBASE_CORE_VERSION           = "+"
 def DEFAULT_FIREBASE_MESSAGING_VERSION      = "+"
@@ -33,5 +33,5 @@ dependencies {
     compile "com.google.firebase:firebase-core:$firebaseCoreVersion"
     compile "com.google.firebase:firebase-messaging:$firebaseMessagingVersion"
     compile 'me.leolin:ShortcutBadger:1.1.17@aar'
-    compile "com.android.support:support-core-utils:27.1.1"
+    compile "com.android.support:support-core-utils:28.0.0"
 }