Missing build for Python 3.7

[dvf]

Not 100% sure, but on first glance it looks like you didn't build for Python 3.7.

I'm running macOS 10.13.2:

(tester--unpHGAN) ➜  tester pip install bencoder.pyx==1.2.1
Collecting bencoder.pyx==1.2.1
  Could not find a version that satisfies the requirement bencoder.pyx==1.2.1 (from versions: 1.0.0, 1.1.0, 1.1.1, 1.1.2, 1.1.3)
No matching distribution found for bencoder.pyx==1.2.1

[whtsky]

Sorry, I forgot to upload source dist to pypi. Should works now.