Consider changing the license

I'm not a lawyer but it seems Unlicense has some issues and no real advantage say over 0BSD or MIT-0. 
Please consider on moving to one of these as this could discourage people to use lockfile. 

Some references:
https://chrismorgan.info/blog/unlicense/
https://fedoraproject.org/wiki/Licensing/Unlicense
https://github.com/github/choosealicense.com/issues/805