Updated post request example in the README file

Author: ech0s7r

README.md

@@ -79,8 +79,8 @@ authHeader = OAuth().get_authorization_header(uri, 'GET', None, '<insert consume
 #### Use of authHeader with requests module (POST and GET example)
 ```python
 headerdict = {'Authorization' : authHeader}
-requests.post(uri,headers=headerdict)
-requests.get(uri,headers=headerdict)
+requests.post(uri, headers=headerdict, data=payload)
+requests.get(uri, headers=headerdict)
 ```
 
 ### Signing HTTP Client Request Objects <a name="signing-http-client-request-objects"></a>