v1.5.1

What's Changed

Adds a cool-off period option between adding states to the undo stores.

• Cool-off period by @funwithtriangles in #23
• Fix/cool off tests by @funwithtriangles in #25

Note: Was having trouble publishing to npm, so version v1.5.0 is the same as v1.5.1

Full Changelog: v1.4.1...v1.5.1