dependency on natxet/cssmin broken

[matthewbaggett]

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for hellogerard/less-slim-middleware 0.1.0 -> satisfiable by hellogerard/less-slim-middleware[v0.1.0].
    - hellogerard/less-slim-middleware v0.1.0 requires natxet/cssmin dev-master#9801e2a0de7ae252ca4f2b85542d75a82047a8b4 -> no matching package found.

[matthewbaggett]

I fixed this for me temporarilly by using:

"natxet/cssmin": "dev-master"

in my composer.json