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

And just want to parse it this way:

type nullWriterReader struct {
	io.Reader
}

func (nw nullWriterReader) Write(p []byte) (n int, err error) {
	return len(p), nil
}

...
// data - is gziped Response
if reader, 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?