Add support for draft/extended-monitor

References: https://github.com/ircv3/ircv3-specifications/pull/466

downstream.go

@@ -205,6 +205,8 @@ var needAllDownstreamCaps = map[string]string{
 	"away-notify":    "",
 	"extended-join":  "",
 	"multi-prefix":   "",
+
+	"draft/extended-monitor": "",
 }
 
 // passthroughIsupport is the set of ISUPPORT tokens that are directly passed

upstream.go

@@ -32,6 +32,8 @@ var permanentUpstreamCaps = map[string]bool{
 	"multi-prefix":     true,
 	"server-time":      true,
 	"setname":          true,
+
+	"draft/extended-monitor": true,
 }
 
 type registrationError string