Removed duplicate import

Author: JDDV

lib/src/google_api_availability.dart

@@ -3,8 +3,6 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 import 'package:google_api_availability/src/models/google_play_services_availability.dart';
 
-import 'models/google_play_services_availability.dart';
-
 /// Flutter plugin to verify if Google Play Services are installed on the
 /// device.
 class GoogleApiAvailability {