Bump po2json from 1.0.0-beta-2 to 1.0.0-beta

Bumps [po2json](https://github.com/mikeedwards/po2json) from 1.0.0-beta-2 to 1.0.0-beta.
- [Release notes](https://github.com/mikeedwards/po2json/releases)
- [Changelog](https://github.com/mikeedwards/po2json/blob/master/History.md)
- [Commits](https://github.com/mikeedwards/po2json/commits)

Signed-off-by: dependabot[bot] <[email protected]>