Version bump for 0.5

CHANGELOG

@@ -1,3 +1,7 @@
+v0.5 (unreleased):
+
+- ...
+
 v0.4 (released January 17, 2017):
 
 - Added a `--prune` flag to delete remote-tracking branches that no longer

gitup/__init__.py

@@ -10,5 +10,5 @@ gitup: the git repository updater
 __author__ = "Ben Kurtovic"
 __copyright__ = "Copyright (C) 2011-2017 Ben Kurtovic"
 __license__ = "MIT License"
-__version__ = "0.4"
+__version__ = "0.5.dev0"
 __email__ = "ben.kurtovic@gmail.com"