adds support for re-exporting crate

[colstrom]

Hiya, thanks for making fake! It's helped me out when testing things, and has even caught a few bugs!

This is a small change to enable using fake when re-exporting it from a crate (as one might do with macros, for instance).

Currently, the anchored ::fake paths effectively require the depending crate to directly depend on fake. This removes those, and (as far as I'm aware) should not break anything except the probably-rare case where there is another module named fake in the current scope, in which case the fix would be to anchor the reference there, rather than requiring it universally to avoid that one weird scenario.

Tests still pass, and I've haven't touched the versioning, since I'm not quite sure what the appropriate bump would be for this. If there's any changes you'd like me to make, just let me know.

Thanks again for making something cool. You rock! ❤️