Bump package version to 0.5.0

- Update version in setup.py from 0.4.1 to 0.5.0
- Prepare for next release with version increment

Author: howethomas

setup.py

@@ -5,7 +5,7 @@
 
 setup(
     name="vcon",
-    version="0.4.1",
+    version="0.5.0",
     author="Thomas McCarthy-Howe",
     author_email="ghostofbasho@gmail.com",
     description="A package for working with vCon containers",