Restore Session.request docstring

Resolves #1251

requests/sessions.py

@@ -252,6 +252,39 @@ class Session(SessionRedirectMixin):
         stream=None,
         verify=None,
         cert=None):
+        """Constructs a :class:`Request <Request>`, prepares it and sends it.
+        Returns :class:`Response <Response>` object.
+
+        :param method: method for the new :class:`Request` object.
+        :param url: URL for the new :class:`Request` object.
+        :param params: (optional) Dictionary or bytes to be sent in the query
+            string for the :class:`Request`.
+        :param data: (optional) Dictionary or bytes to send in the body of the
+            :class:`Request`.
+        :param headers: (optional) Dictionary of HTTP Headers to send with the
+            :class:`Request`.
+        :param cookies: (optional) Dict or CookieJar object to send with the
+            :class:`Request`.
+        :param files: (optional) Dictionary of 'filename': file-like-objects
+            for multipart encoding upload.
+        :param auth: (optional) Auth tuple or callable to enable
+            Basic/Digest/Custom HTTP Auth.
+        :param timeout: (optional) Float describing the timeout of the
+            request.
+        :param allow_redirects: (optional) Boolean. Set to True by default.
+        :param proxies: (optional) Dictionary mapping protocol to the URL of
+            the proxy.
+        :param return_response: (optional) If False, an un-sent Request object
+            will returned.
+        :param config: (optional) A configuration dictionary. See
+            ``request.defaults`` for allowed keys and their default values.
+        :param prefetch: (optional) whether to immediately download the response
+            content. Defaults to ``True``.
+        :param verify: (optional) if ``True``, the SSL cert will be verified.
+            A CA_BUNDLE path can also be provided.
+        :param cert: (optional) if String, path to ssl client cert file (.pem).
+            If Tuple, ('cert', 'key') pair.
+        """
 
         cookies = cookies or {}
         proxies = proxies or {}