No-command subscription

Main goal of this release was issue #23.

Reaction-based Role Assignment

This fixes a minor issue where the bot would assign itself roles while setting up the reaction-based role assignment.

Reaction-based Role Assignment

Main feature added is #22 but also fleshed out README.md.

Respect member nicknames

Main issues addressed are #20 and #21. Also locked the Dockerfile down to use yarl v1.1.1.

EX gating

EX gating is now working.

v0.1

The bot is currently feature complete.