v0.2.1

No idea why v0.2.0 didn't show up on github; here's a changelog for both.

v0.2.1:

• fixed another really obvious bug
  v0.2.0:
• added drop d and drop-highest dh dice modifiers
• rewrote README to be more direct
• added /stats command to show server & user count
• added compact option to /roll