Restore composer version for Packagist

[unfulvio-godaddy]

Summary

In https://github.com/10up/wp_mock/pull/242 we removed the version from composer.json in the hopes of fixing #241 however it seem having had no effect. The assumption was packagist should have read from git tags instead (which list 1.0.1 correctly). Maybe this has to do with packagist configuration, to which I have no access to as of yet.

Closes: #243

Contributor checklist

• [x] I agree to follow this project's Code of Conduct.
• [x] I have updated the documentation accordingly
• [x] I have added tests to cover changes introduced by this pull request
• [x] All new and existing tests pass

Testing

No code change.

Reviewer checklist

- [ ] Code changes review - [ ] Documentation changes review - [ ] Unit tests pass - [ ] Static analysis passes

[coveralls]

coverage: 66.312% (-0.1%) from 66.445% when pulling ab5d65cdf8f4152bbb877de649f0463ab0fc51ab on chore/restore-composer-version into 48b7f22934a4351e45e336f09263ee27fc9ddcbe on trunk.

[unfulvio-godaddy]

ignore coveralls: no code change