Add missing blankline in ProxyClient docstring

Signed-off-by: Sebastian Wojciechowski <s.wojciechowski89@gmail.com>

Author: sebwoj

fedora/client/proxyclient.py

@@ -101,6 +101,7 @@ class ProxyClient(object):
         forever.
 
     .. attribute:: timeout
+
         A float describing the timeout of the connection. The timeout only
         affects the connection process itself, not the downloading of the
         response body. Defaults to 120 seconds.