Lighten the warning language of WKWebView. It is definitely becoming stable by now

Author: marcuswestin

README.md

@@ -102,8 +102,7 @@ setupWebViewJavascriptBridge(function(bridge) {
 WKWebView Support (iOS 8+ & OS 10.10+)
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-WARNING: WKWebView still has [many bugs and missing network APIs.](https://github.com/ShingoFukuyama/WKWebViewTips/blob/master/README.md) It may not be a simple drop-in replacement.
-
+(WARNING: WKWebView still has [bugs and missing network APIs.](https://github.com/ShingoFukuyama/WKWebViewTips/blob/master/README.md) It may not be a simple drop-in replacement).
 
 WebViewJavascriptBridge supports [WKWebView](http://nshipster.com/wkwebkit/) for iOS 8 and OSX Yosemite. In order to use WKWebView you need to instantiate the `WKWebViewJavascriptBridge`. The rest of the `WKWebViewJavascriptBridge` API is the same as `WebViewJavascriptBridge`.