minor: fix copyright date

Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

offlineimap/imapserver.py

@@ -1,5 +1,5 @@
 # IMAP server support
-# Copyright (C) 2002 - 2011 John Goerzen & contributors
+# Copyright (C) 2002 - 2016 John Goerzen & contributors
 #
 #    This program is free software; you can redistribute it and/or modify
 #    it under the terms of the GNU General Public License as published by
@@ -29,13 +29,12 @@ import errno
 from sys import exc_info
 from socket import gaierror
 from ssl import SSLError, cert_time_to_seconds
+import six
 
 from offlineimap import imaplibutil, imaputil, threadutil, OfflineImapError
 import offlineimap.accounts
 from offlineimap.ui import getglobalui
 
-import six
-
 
 try:
     # do we have a recent pykerberos?
@@ -46,6 +45,7 @@ try:
 except ImportError:
     pass
 
+
 class IMAPServer(object):
     """Initializes all variables from an IMAPRepository() instance
 
@@ -181,7 +181,9 @@ class IMAPServer(object):
         :param drop_conn: If True, the connection will be released and
            not be reused. This can be used to indicate broken connections."""
 
-        if connection is None: return #noop on bad connection
+        if connection is None:
+            return # Noop on bad connection.
+
         self.connectionlock.acquire()
         self.assignedconnections.remove(connection)
         # Don't reuse broken connections