Version 3.1.3 missing from pypi

[iashwash]

Howdy,
Version 3.1.3 isn't grabbable via pip anymore:

> pip install bitstring==3.1.3
Collecting bitstring==3.1.3
  Could not find a version that satisfies the requirement bitstring==3.1.3 (from versions: 0.3.2, 0.4.0, 0.4.1, 0.4.2, 0.4.3, 0.5.0, 0.5.1, 0.5.2, 1.0.0, 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.2.0, 1.3.0, 2.0.0b1, 2.0.1b2, 2.0.2, 2.0.3, 2.1.0, 2.1.1, 2.2.0, 3.0.0, 3.0.1, 3.0.2, 3.1.0, 3.1.1, 3.1.2, 3.1.4)
No matching distribution found for bitstring==3.1.3

Oddly it's still on PyPI.
Was this deliberate? I don't see anything in the changelog that says the older version should have been taken down. Newest package works great, but If this was deliberate I'm curious if I should force update running installs.

[iashwash]

... And I should obviously read closed issues before posting - #159