Improvements to the interface and the documentation

It's been a while since a release and I realized when I came back I had messed up the previous release + tag. I've deleted that release, and instead, present to you a small improvement to the interface to allow easier use.

Interface

The interface used to expect only &str and while I found that easy to deal with, I realized it was just a little bit more code to make it even easier by using AsRef<str>.

Documentation

I also went over the documentation and improved it a bit. Thanks for any and all downloads and lmk if you have any suggestions.

v0.1.4

Added strip_extensions

v0.1.3 add `contains` and fix documentation

the title really says it all