Drop support for unsupported Python versions (2.7 and 3.4)

[GhostofGoes]

The first "stable" release should not be chock full of hacks for unsupported Python versions. Presently, Python 2.7 makes up <10% of package installs (according to pypistats.org), and 3.4 almost none.

If someone is using those versions they can simply use the last release to support them, which will be 0.9.0.