[enh] release 0.4

CHANGELOG

 Changelog
 =========
-0.4 (unreleased)
+0.4 (2014-12-11)
 ----------------
 - compatibility with baron upstream (removal of def_argument_node and
   uniformisation of def_arguments structure)
+- fix: long wasn't supported in redbaron (due to a bug in baron)
 0.3 (2014-11-12)
 ----------------

setup.py

@@ -12,7 +12,7 @@ except ImportError:
 setup(name='redbaron',
-      version='0.3',
+      version='0.4',
       description='Abstraction on top of baron, a FST for python to make writing refactoring code a realistic task',
       author='Laurent Peuch',
       long_description=read_md("README.md") + "\n\n" + open("CHANGELOG", "r").read(),