Put files at last

Now I have to call `licentia set mpl2 "GT" '*.go' '//'`, which feels awkward (can't use shell's globbing).
With this patch, we can call `licentia set mpl2 "GT" '//' *.go`, and list any number of files or patterns, as we wish.

Maybe you had a good reason to not use shell's globbing, I don't know. As this is a non-backwards-compatible change, I trust your judgment.