Fix a typo in Readme

`asynchronously` → `asynchronously`

README.md

@@ -287,7 +287,7 @@ Note that most methods on ```GCDWebServer``` to add handlers only require the ``
 Asynchronous HTTP Responses
 ===========================
 
-New in GCDWebServer 3.0 is the ability to process HTTP requests aysnchronously i.e. add handlers to the server which generate their ```GCDWebServerResponse``` asynchronously. This is achieved by adding handlers that use a ```GCDWebServerAsyncProcessBlock``` instead of a ```GCDWebServerProcessBlock```. Here's an example:
+New in GCDWebServer 3.0 is the ability to process HTTP requests asynchronously i.e. add handlers to the server which generate their ```GCDWebServerResponse``` asynchronously. This is achieved by adding handlers that use a ```GCDWebServerAsyncProcessBlock``` instead of a ```GCDWebServerProcessBlock```. Here's an example:
 
 **(Synchronous version)** The handler blocks while generating the HTTP response:
 ```objectivec