Removed the JSON related implementations from the project.

Author: Martin Brecht-Precht

README.md

@@ -299,6 +299,13 @@ $response = $request->addAuthentication($clientCertificateAuthentication);
 
 ---
 
+## Extending the Basic HTTP Client
+
+Every part of the client is based upon proper interfaces. Most class instances can get injected into the client itself. 
+If you want to extend the client just write some classes implementing the according interface and you´re done with that. 
+
+Take a look at the [PHP JSON HTTP Client](https://github.com/markenwerk/php-json-http-client) which is an extension of the PHP Basic HTTP Client.
+
 ## Exception handling
 
 PHP Basic HTTP Client provides different exceptions – also provided by the PHP Common Exceptions project – for proper handling.