v5.1.1 Release - Update README

I always forget this

v5.0.2 p2

* Update README

v5.0.1 (#29)

This update includes fixes to commands:
* userinfo -> corrected default avatar handling.
* config -> Patch bug where supplying 'next' to the default results in the bot having a fit about json in console, not continuing for user.
* botcontrols -> You can now restart the bot and actually restart it. No more reloading everything but the main bot.js file.

Also including fixes to:
* All events requiring audit log pulling -> Patched bug where fetching audit log data got the wrong user. For instance, for a user deleting their own message, it would show the last user who deleted their message prior.
* ready event -> Patched bug where invite caching causes 429 (ratelimit) errors and possible improper logging of invites.
* verification -> Patched bug where running multiple verification may cause the database to freak out because the primary key was set to serverID and not something like code.

Merge pull request #28 from TMC-Software/TCBv5-hotfix

v5 Hotfix