changelog and bump (#3454)

docs/changelog_3_3_0.rst

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+.. 3.3.x Changelogs
+
+Redbot 3.3.0 (2020-01-26)
+=========================
+
+Core Bot
+--------
+
+- The bot's description is now configurable.
+- We now use discord.py 1.3.1, this comes with added teams support.
+- The commands module has been slightly restructured to provide more useful data to developers.
+- Help is now self consistent in the extra formatting used.
+
+Core Commands
+-------------
+
+- Slowmode should no longer error on nonsensical time quantities.
+- Embed use can be configured per channel as well.
+
+Documentation
+-------------
+
+- We've made some small fixes to inaccurate instructions about installing with pyenv.
+- Notes about deprecating in 3.3 have been altered to 3.4 to match the intended timeframe.
+
+Admin
+-----
+
+- Gives feedback when adding or removing a role doesn't make sense.
+
+Audio
+-----
+
+- Playlist finding is more intuitive.
+- disconnect and repeat commands no longer interfere with eachother.
+
+CustomCom
+---------
+
+- No longer errors when exiting an interactive menu.
+
+Cleanup
+-------
+
+- A rare edge case involving messages which are deleted during cleanup and are the only message was fixed.
+
+Downloader
+----------
+
+- Some user facing messages were improved.
+- Downloader's initialization can no longer time out at startup.
+
+General
+-------
+
+- Roll command will no longer attempt to roll obscenely large amounts.
+
+Mod
+---
+
+- You can set a default amount of days to clean up when banning.
+- Ban and hackban now use that default.
+- Users can now optionally be DMed their ban reason.
+
+Permissions
+-----------
+
+- Now has stronger enforcement of prioritizing botwide settings.