AFNetworking/AFJSONRPCClient — pull request #14 by mspasov (2014-04-23 15:35:54+00:00)
Title: Fix deprecation warning

Don't use the deprecated
````
- (NSMutableURLRequest *)requestWithMethod:(NSString *)method URLString:(NSString *)URLString parameters:(id)parameters DEPRECATED_ATTRIBUTE;
```
Instead use
```
- (NSMutableURLRequest *)requestWithMethod:(NSString *)method URLString:(NSString *)URLString parameters:(id)parameters error:(NSError * __autoreleasing *)error;
```