Update Tox, Add MyPy, .pre-commit configurations#18

Closed

ProjectCheshire wants to merge 13 commits intographql-python:masterfrom

ProjectCheshire:master

Commits on Mar 29, 2019

changes for tox and other CI for consistency with graphene
mynja
committed
Travice, setup changes
mynja
committed
direct copy from graphene for coveragerc editorconfig isort pre-commit - flake8 currently fails on files, to be fixed in other commit
mynja
committed