Bump version to 0.5.0.6 for PyPI release [skip ci]

Author: blag

setup.py

@@ -15,7 +15,7 @@ def read(fname):
 
 setup(
     name='django-cities',
-    version='0.5.0.5',
+    version='0.5.0.6',
     description='Place models and worldwide place data for Django',
     author='Ben Dowling',
     author_email='[email protected]',