Problem Description

Hi, I'm not sure about this, but http_version returns HTTP/2 as HTTP/2.0 which is not the standard protocol naming.

Code Reference:

https://github.com/mitmproxy/mitmproxy/blob/332f222994deb27bb0ab68618b23f270b3bdfe2d/mitmproxy/http.py#L263C5-L263C35