Just bought your plugin and it seems like doesn't work properly, while trying to install it via admin (sync) it says:
1Loading composer repositories with package information
3Your requirements could not be resolved to an installable set of packages.
5- Root composer.json requires pkurg/customfields-plugin ^2.2, found pkurg/customfields-plugin[dev-master] but it does not match the constraint.
All of my other plugins are perfectly fine, except yours