Bump minSDKVersion to 19

Author: emawby

example/android/app/build.gradle

@@ -24,7 +24,7 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.onesignal.onesignalexample"
-        minSdkVersion 16
+        minSdkVersion 19
         targetSdkVersion 33
         versionCode 1
         versionName "1.0"