Most recent version not installed with pip

[serenalotreck]

I still get the sklearn deprecation warning about sklearn.ensemble.forest, and when I ran pip install --upgrade treeinterpreter, I got the message that I was already up-to-date.

[Strandtasche]

that's because while the fix for the deprecation warning was merged in #30, there hasn't been a release since then.

when you look at the release history you see that the most recent version is from December 2018. I've already created Issue #37, asking the maintainer to do a new release so the changes made since then make it to the pypi version.

If you don't want to wait for that, you could always just build this library from source, then you would get all of the new additions made in this repo