Release v1.6.3

Release 1.6.2

Move pypi deployment to py36 env (#46)

pypi deployment scripts require py36 as minimum,
let's move deployment to py36 env.

Release 1.6.0

Release 1.5.0

Release 1.4.2

Release 1.4.1

Release 1.4.0

Release 1.3.0

Release v1.2.0