golang: Fix typo in __all__

A comma was missing - this way last element was 'funcgimport', not
'func' and 'gimport', and so `from golang import *` was failing.

golang/__init__.py

 # -*- coding: utf-8 -*-
-# Copyright (C) 2018  Nexedi SA and Contributors.
+# Copyright (C) 2018-2019  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -28,7 +28,7 @@
 ...
 """
 
-__all__ = ['method', 'go', 'chan', 'select', 'default', 'defer', 'panic', 'recover', 'func' 'gimport']
+__all__ = ['method', 'go', 'chan', 'select', 'default', 'defer', 'panic', 'recover', 'func', 'gimport']
 
 from golang._gopath import gimport  # make gimport available from golang
 import inspect, threading, collections, random, sys