v0.1.3

Add default version tag prefix `v[0-9]*`

v0.1.2

Fix author date to work with older git versions

The `%aI` format string used previously seems to have appeared
in git v2.3.8. We use `%at` which returns an epoch instead and
seems to be available in older versions.

v0.1.0

Add description and keywords to package.json

v0.0.5

Expose as CLI executable