Upgrades release candidate to full release

Barely any changes but had never promoted v0.2.0-rc.1 to a full release.

Adds `AtomicMap`, improves docs, `fnv` feature

Adds AtomicMap, a thread-safe map to track sequences by key. Release also includes new "fnv" feature, which enables the use of the FNV hasher for the HashMap backing Map and AtomicMap, as well as a range of small improvements.

Fixes `AtomicIncr` ordering bug, adds functionality across the board

v0.1.1

version bump to v0.1.1

v0.1.0

Initial version of the library in relatively good working order.