Incrementing version to v4.0.0

Author: wolph

progressbar/__about__.py

@@ -19,7 +19,7 @@
 long running operations.
 '''.strip().split())
 __email__ = '[email protected]'
-__version__ = '3.55.0'
+__version__ = '4.0.0'
 __license__ = 'BSD'
 __copyright__ = 'Copyright 2015 Rick van Hattem (Wolph)'
 __url__ = 'https://github.com/WoLpH/python-progressbar'