doc: Updated patching instructions

Author: Jonas Pfenniger

README.txt

@@ -13,7 +13,7 @@ after a successful HTTP requests. The patch adds request.connection.hikack()
 to change that behavior in case of WebSocket connections.
 
 To apply the patches, go in the root of your nodejs code, and apply:
- `patch -P0 < ../path-to/node-http-websocket/patches/*.patch`
+ `git am ../path-to/node-http-websocket/patches/*.patch`
 
 
 Cheers,