Prepare for v2.12.1 (#312)

HTTP/2 expect: 100-continue updates. (#308)

Preparing for v2.11.0 (#297)

Preparing for v2.10.1 release (#286)

Prepare for v2.10.0 release (#283)

Preparing for the v2.9.0 release (#279)

Python 3.11 http2_abort updates (#263)

The formatting of exception strings changed in httpx for Python 3.11.
This patch adjusts test expectations for this.

Prepare for the v2.8.0 release (#255)

Removed unused write_count variable (#250)

Support GOAWAY HTTP/2 frames.