🐛 Switched setup's metaclass to py2 syntax

To make py2 parse correctly the file and show the nice "use python3"
error. Added a hack to have a py2/py3 support for metaclass on Version,
to avoid the new `metaclass=` syntax in setup.py.

* Fixes issue #31

Signed-off-by: Guyzmo <[email protected]>

Author: guyzmo

setup.py

@@ -63,8 +63,12 @@ def info(cls):
     def __str__(cls):
         return '.'.join(map(str, cls.info))
 
+# Hack for metaclass support in both Py2 and Py3
+class VersionInfo_metaclass(VersionInfo):
+	def __new__(cls, *bases):
+		return VersionInfo('version_info', bases, {})
 
-class Version(Command, metaclass=VersionInfo):
+class Version(VersionInfo_metaclass(Command)):
     description = 'Bump version number'
     user_options = [
             ('major', 'M', 'Bump major part of version number'),