Bump to 0.6.13

newsbox/__init__.py

 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-__version__ = '0.6.12'
+__version__ = '0.6.13'

tbump.toml

 [version]
-current = "0.6.12"
+current = "0.6.13"
 
 # Example of a semver regexp.
 # Make sure this matches current_version before