Add a tox linting environment.
Add a tox linting environment.

mhils/hyper-h2,python-hyper/hyper-h2,Kriechi/hyper-h2,vladmunteanu/hyper-h2,python-hyper/hyper-h2,vladmunteanu/hyper-h2,Kriechi/hyper-h2,bhavishyagopesh/hyper-h2