update example proj

example/android/app/build.gradle

 def enableProguardInReleaseBuilds = false
 
 android {
-    compileSdkVersion 23
+    compileSdkVersion 25
     buildToolsVersion "25.0.1"
 
     defaultConfig {
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:appcompat-v7:23.0.1'
     compile 'com.facebook.react:react-native:+'
     compile project(':react-native-navigation')
 }