Bump and release 1.2.0

Bump and release 1.1.0

Bump and release 1.0.0

Bump and release 0.15.0

Release 0.14.1

Loosen the h11 requirement

h11 0.9.0 is also compatible with wsproto, therefore >= 0.8.1 is
better defined.

Bump and release 0.14.0

Bump and release 0.13.0

Bump and release 0.12.0