update example project

Author: LeowWH

android/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.library'
 
 android {
     compileSdkVersion 27
-    buildToolsVersion "27.0.0"
+    buildToolsVersion "27.0.3"
 
     defaultConfig {
         minSdkVersion 16
@@ -13,6 +13,11 @@ android {
 }
 
 dependencies {
+<<<<<<< HEAD
     compile 'com.facebook.react:react-native:+'
     compile 'com.molpay:molpay-mobile-xdk-android:3.20.0'
+=======
+    implementation 'com.facebook.react:react-native:+'
+    implementation 'com.molpay:molpay-mobile-xdk-android:3.21.0'
+>>>>>>> 489a072... update android gradle
 }