[enh] release 0.6.3

CHANGELOG

 Changelog
 =========
-0.6.3 (unreleased)
+0.6.3 (2017-01-02)
 ------------------
+
 - group formatting at start of file or preceded by space with comment
 0.6.2 (2016-03-18)

setup.py

@@ -12,7 +12,7 @@ except ImportError:
 setup(name='baron',
-      version='0.6.2',
+      version='0.6.3',
       description='Full Syntax Tree for python to make writing refactoring code a realist task',
       author='Laurent Peuch',
       long_description=read_md("README.md") + "\n\n" + open("CHANGELOG", "r").read(),