Update version

Forgot to update the version number from last commit

Author: chinyeungli

src/attributecode/__init__.py

@@ -27,7 +27,7 @@
     basestring = str  # Python 3
 
 
-__version__ = '3.0.0'
+__version__ = '3.0.1'
 
 
 __about_spec_version__ = '3.0.0'