Add Mk3 Mini Expansion Pack from Kerbal Stuff

This pull request was automatically generated by Kerbal Stuff on behalf of kyeon, to add [Mk3 Mini Expansion Pack](https://kerbalstuff.com/mod/449/Mk3%20Mini%20Expansion%20Pack) to CKAN.

Please direct questions about this pull request to [kyeon](https://kerbalstuff.com/profile/kyeon).