Adding 'import requests' to readme code snippet. (#3700)

* added import requests to small demo

README.rst

@@ -15,6 +15,7 @@ Behold, the power of Requests:
 
 .. code-block:: python
 
+    >>> import requests
     >>> r = requests.get('https://api.github.com/user', auth=('user', 'pass'))
     >>> r.status_code
     200

docs/index.rst

@@ -17,6 +17,7 @@ constantly reading documentation, depression, headaches, or even death.
 
 Behold, the power of Requests::
 
+    >>> import requests
     >>> r = requests.get('https://api.github.com/user', auth=('user', 'pass'))
     >>> r.status_code
     200