fixed example project

Author: LeowWH

MOLPayReactExampleProject/android/app/build.gradle

@@ -90,8 +90,8 @@ def enableSeparateBuildPerCPUArchitecture = false
 def enableProguardInReleaseBuilds = false
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion "23.0.1"
+    compileSdkVersion 27
+    buildToolsVersion "27.0.0"
 
     defaultConfig {
         applicationId "com.molpayreactexampleproject"
@@ -134,7 +134,7 @@ android {
 
 dependencies {
     compile fileTree(dir: "libs", include: ["*.jar"])
-    compile "com.android.support:appcompat-v7:23.0.1"
+    compile "com.android.support:appcompat-v7:27.0.0"
     compile "com.facebook.react:react-native:+"  // From node_modules
     compile project(':molpay-mobile-xdk-reactnative-beta')
 }