Update urllib documentation to include the context parameter in urlretrieve

Author: lysnikolaou

Doc/library/urllib.rst

@@ -154,7 +154,7 @@ High-level interface
       of :func:`urllib2.urlopen`.
 
 
-.. function:: urlretrieve(url[, filename[, reporthook[, data]]])
+.. function:: urlretrieve(url[, filename[, reporthook[, data[, context]]]])
 
    Copy a network object denoted by a URL to a local file, if necessary. If the URL
    points to a local file, or a valid cached copy of the object exists, the object
@@ -179,6 +179,10 @@ High-level interface
    :mimetype:`application/x-www-form-urlencoded` format; see the :func:`urlencode`
    function below.
 
+   The *context* parameter may be set to a :class:`ssl.SSLContext` instance to
+   configure the SSL settings that are used if :func:`urlretrieve` makes a HTTPS
+   connection.
+
    .. versionchanged:: 2.5
       :func:`urlretrieve` will raise :exc:`ContentTooShortError` when it detects that
       the amount of data available  was less than the expected amount (which is the
@@ -196,6 +200,9 @@ High-level interface
       the size of the data it has downloaded, and just returns it.  In this case you
       just have to assume that the download was successful.
 
+   .. versionchanged:: 2.7.9
+      The *context* parameter was added. All the neccessary certificate and hostname checks are done by default.
+
 
 .. data:: _urlopener