Minor update: Add 'Sum' trait

• Add 'Sum' trait for Amount
• cargo update

Full Changelog: v0.2.2...v0.2.4

v0.2.2 - Expose Hash struct

Full Changelog: v0.2.1...v0.2.2

v0.2.1

What's Changed

• Bump mio from 0.8.9 to 0.8.11 by @dependabot in #2
• update actions for to try and get new node version to remove warnings by @Danconnolly in #3

Full Changelog: v0.2.0...v0.2.1

Docs & Re-org

Improved documentation and re-organise the library to be more logical.

v0.1.0

First release.