* chore: bump version to 2.2.3
* chore: add changelog for 2.2.3
* chore: bump tested up to
* chore: add grunt-cli
Allows us to run grunt tasks for release prep without having
to install grunt globally.
For example:
```sh
npx grunt checktextdomain
npx grunt makepot
```
* chore: upgrade grunt-wp-i18n
`npx grunt makepot` fails otherwise.
* chore: regenerate pot file
By running `npx grunt makepot`.
No changes to strings, just updates to the version and dates.