change version format for dev versions

setup.py

     # Versions should comply with PEP440.  For a discussion on single-sourcing
     # the version across setup.py and the project code, see
     # https://packaging.python.org/en/latest/single_source_version.html
-    version='0.4.6',
+    version='0.4',
 
     description='HTTP api input/output manager',
     # long_description=long_description,