Inconsistent Python version support listed on homepage vs. docs

[mprostock]

Just a minor thing, not really an "issue" but you might want to fix or "harmonize" this anyways:

https://hypothesis.works/products/
lists

• Python Versions 2.7 and 3.4/3.5 as supported

https://hypothesis.readthedocs.io/en/latest/supported.html#python-versions
lists

• CPython 3.6+ as supported

[Zac-HD]

@DRMacIver - how about we merge the website into this monorepo so that future grepping catches such issues too? In #1224 I said

Closing this as basically finished and definitely inactive. If we want to merge the website in too, we should open a new issue just for that.

but it seems like it might be time. We could add previews to each PR, too.

[Zac-HD]

Now fixed 🎉