DOC: setup.py version 0.3.1
Merge branch 'release/0.3.1'

* release/0.3.1:
  DOC: setup.py version 0.3.1
Merge tag 'v0.3.1' into develop

RLS: pyline v0.3.1

* tag 'v0.3.1':
  DOC: setup.py version 0.3.1