Fix Android build error

platform/android/build.gradle.template

@@ -20,7 +20,7 @@ allprojects {
 }
 
 dependencies {
-	compile 'com.android.support:support-v4:23.+'  // can be removed if minSdkVersion 16 and modify DownloadNotification.java & V14CustomNotification.java
+	compile 'com.android.support:support-v4:27.+'  // can be removed if minSdkVersion 16 and modify DownloadNotification.java & V14CustomNotification.java
 	$$GRADLE_DEPENDENCIES$$
 }