Added examples on using WKWebView to the README

Author: lokimeyburg

README.md

@@ -86,7 +86,9 @@ WebViewJavascriptBridge supports [WKWebView](http://nshipster.com/wkwebkit/) for
 
 1) Import the header file:
 
+```
 #import "WKWebViewJavascriptBridge.h"
+```
 
 2) Instantiate WKWebViewJavascriptBridge and with a WKWebView object