Add __version__

per PEP8
https://www.python.org/dev/peps/pep-0008/#module-level-dunder-names

refs: zaproxy/zaproxy#3356

Author: Greg Guthe

src/zapv2/__init__.py

@@ -20,6 +20,7 @@
 """
 
 __docformat__ = 'restructuredtext'
+__version__ = '0.0.9'
 
 import requests
 from requests.packages.urllib3.exceptions import InsecureRequestWarning