Upload source package to PyPI that errors out

[itamarst]

Should say something like "You need either newer Fil, or you're on an unsupported platform."

Two motivations:

• Unsupported platforms.
• People who haven't upgraded pip and are stuck on 0.7.2.

[itamarst]

Looks like there aren't that many downloads of 0.7.2 (last manylinux1), though still perhaps enough to justify doing this.