This started as a feature request for our upstream API (closes#33) that
led to a bit of rework to help make the library a bit more flexible in
terms of not needing modification when something on the API changes.
This update also includes your typical round of dependency updates and a
bit of preemptive planning by way of dropping support for Node.js as
we're on the cusp of it being out of maintenance and the release of
Node.js v18.
Added support for our new workdays endpoint that allows you to pull the
number of working days that occur between two dates.
In addition to the new endpoint:
* chore: upgraded dependencies.
* ci: dropped Node.js 10 because it past EOL.
* ci: swapped Node.js 15 for 16 now that it's out.
* docs: added example of new endpoint.
Bumped `typescript` up to v4.x as well as a bunch of other dependencies,
including `jest` which had a moderate severity from it's `node-notifier`
dependency. Also added Node.js v15.x to the automated testing.
* test: Dropped Node v13.x since it's now past it's expiration.
* test: Migrated from Travis CI to GitHub Actions.
* test: Migrated from Coveralls to CodeCov.
* docs: Dropped over 1.x stuff from the read me.
* perf: Updated dependencies and rebuilt against latest TypeScript.
* feat: Bumped major version number due to Node.js support changing.
