frp/Release.md

### Fixes

* Fixed an issue where HTTP/2 was not enabled for https2http and https2https plugins.

### Changes

* Updated the default value of `transport.tcpMuxKeepaliveInterval` from 60 to 30.
return 504 instead of 404 for proxy type http request timeout (#4151) 10 months ago			`### Fixes`

plugin: fix http2 not enabled for https2http and https2https plugin (#4230) 9 months ago			`* Fixed an issue where HTTP/2 was not enabled for https2http and https2https plugins.`
update the default value of transport.tcpMuxKeepaliveInterval (#4231) 9 months ago
			`### Changes`

			* Updated the default value of `transport.tcpMuxKeepaliveInterval` from 60 to 30.