v1.2.0

Includes fixes for
#7
#8
#9

Hopefully that's the last of it :D

v1.1.0

• Fix underflow edge case (thanks @tadhunt!).
• Add modules (about time!)
• Unify context/non-context code.

v1.0

Probably about time to one-dot-oh this.

v0.11

Probably the last "release" before 1.0. Feedback welcome

v0.10

New API. Opinionated and concurrency-safe

0.9

Initial release.