add http2 version support

[0x123456789]

Hello ProjectDiscovery team, seam like we cant parse HTTP2 request from bytes or string because of version logic. I have the following usecase:

1. I get this response from Burp:

HTTP/2 200 OKServer: nginx/1.17.9Date: Sat, 30 Mar 2024 17:36:11 GMTContent-Type: application/javascript; charset=utf-8Access-Control-Allow-Origin: *Cache-Control: public, max-age=31556952Etag: W/"af07e301570ab6511cd61c64c4fb822c"Expires: Sun, 30 Mar 2025 23:20:38 GMTLast-Modified: Fri, 15 Mar 2024 13:33:33 GMT

And just want to parse it this way:

typenullWriterReaderstruct {
io.Reader
}
func (nwnullWriterReader) Write(p []byte) (nint, errerror) {
returnlen(p), nil
}
...// data - is gziped Responseifreader, err=gzip.NewReader(bytes.NewReader(data)); err!=nil {
c.JSON(errors.BadRequestError(err))
return
}
rw:=nullWriterReader{reader}
client:=client.NewClient(rw)
res, err:=client.ReadResponse(false)

ReadResponse return error because it doesn't know about HTTP/2 can be without minor version then calling ReadVersion(). My commit should help solve this case

[0x123456789]

I know it's not like "real" HTTP/2 support, but this simple changes allow to read response for example from text file

[Mzack9999]

lgtm! - The definitive solution would be forking the standard library and removing all validations as done in #112 (unfinished)

[0x123456789]

@Mzack9999 Thank you, can this pull request be merged?