Version 4.1.0

• Pybooru: refactored _get_status()
• Python 3.6 support
• Fixed PybooruHTTPError
• Pybooru: now site_name and site_url are @property
• Remove Pylint references
• End of Python 2.6 support
• Danbooru: added post_mark_translated()
• Danbooru: added post_unvote()
• Danbooru: added post_flag_show()
• Danbooru: added post_appeals_show()
• Danbooru: added post_versions_show()
• Danbooru: added post_versions_undo()
• Danbooru: added comment_undelete()
• Danbooru: added comment_vote()
• Danbooru: added comment_unvote()
• Danbooru: added artist_undelete()
• Danbooru: added tag_show()
• Danbooru: added tag_udpate()
• Danbooru: added wiki_delete()
• New docstring format
• Added support for Danbooru accounts levels.
• Refactored api_moebooru.py
• Code improvements
• Documentation improvement