ignoring frame size negotiation

[HoneyryderChuck]

Coming from: https://gitlab.com/honeyryderchuck/httpx/issues/59 .

If you look at the shown frame negotiation, you can see that the server negotiates an increase of max frame size. However, this is never taken into account, as data frame parsing fails with common_header': Frame size is too large: 95846 (HTTP2::Error::CompressionError).

The main offender seems to be this condition, which doesn't do a thing.

[igrigorik]

Resolved via #157.