bump version to 0.4 with the Python v3 changes

Author: bear

ronkyuu/__init__.py

@@ -8,7 +8,7 @@
 __email__        = 'bear@bear.im'
 __copyright__    = 'Copyright (c) 2013-2016 by Mike Taylor and Kartik Prabhu'
 __license__      = 'MIT'
-__version__      = '0.3.7'
+__version__      = '0.4'
 __url__          = 'https://github.com/bear/ronkyuu'
 __download_url__ = 'https://pypi.python.org/pypi/ronkyuu'
 __description__  = 'Webmention Manager'