Merge pull request #2 from sethladd/patch-1

Prefer var

README.md

@@ -21,7 +21,7 @@ For help getting started with Flutter, view our online
 ### Dart
 
 ```dart
-FlutterWebviewPlugin flutterWebviewPlugin = new FlutterWebviewPlugin();
+var flutterWebviewPlugin = new FlutterWebviewPlugin();
 ```
 
 ### Android