Bump version

Bump for internal use

Bump gunicorn thrift version

Bump for internal release

update 19.6.0 changelog

add changelog

releae often shoudl be our mantra. We have too much fixes in that release that
were waiting since a while. Let's start a month release (ore more) from now.

keep a consistent style

it should be 19.4.4

bump to 19.4.3

fix typo