Updated android/build.gradle

Due to a gradle bug, moved google() above jcenter() to fix some missing dependency issues

Author: Nightsd01

examples/RNOneSignal/android/build.gradle

@@ -16,8 +16,8 @@ buildscript {
 allprojects {
     repositories {
         mavenLocal()
-        jcenter()
         google()
+        jcenter()
         maven {
             // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
             url "$rootDir/../node_modules/react-native/android"