version bump
Use django.utils.six for PY2/PY3 compatibility
Use input from django.utils.six.moves, remove cms.utils.compat.input module
Use django.utils.six.moves for StringIO, one more file from CMS is gone
Updated CHANGELOG.txt file to fix release information
Merge pull request #3289 from mmarzantowicz/feature/PY2_PY3_support_cleanup

Use django.utils.six for PY2/PY3 compatibility
[requires.io] dependency update
[requires.io] dependency update
Simply add a heredoc string to CMSPluginBase.get_plugin_instance()
Merge pull request #3293 from mkoistinen/add_heredoc_to_get_plugin_instance

Simply add a heredoc string to CMSPluginBase.get_plugin_instance()
Merge pull request #3292 from divio/requires-io-develop

[requires.io] dependency update on develop branch
Fixed #3297: minor typo errors
Merge pull request #3298 from mmarzantowicz/issues/3297

Fixed #3297: minor typo errors
Add more explanation for including in URLs. Thanks to <mkoistinen> at #django-cms on IRC.
Corrected a small mistake.