Update the android SDK version to 25 in example

Author: markusguenther

example/android/app/build.gradle

@@ -69,8 +69,8 @@ def enableSeparateBuildPerCPUArchitecture = false
 def enableProguardInReleaseBuilds = false
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion "23.0.3"
+    compileSdkVersion 25
+    buildToolsVersion "25.0.0"
 
     defaultConfig {
         applicationId "com.airbnb.android.react.maps.example"