upgrade ircmsg again

go.mod

 	github.com/go-sql-driver/mysql v1.5.0
 	github.com/go-test/deep v1.0.6 // indirect
 	github.com/gorilla/websocket v1.4.2
-	github.com/goshuirc/irc-go v0.0.0-20201116034710-7e7b0985c4b5
+	github.com/goshuirc/irc-go v0.0.0-20201118022549-7209d10d54a8
 	github.com/onsi/ginkgo v1.12.0 // indirect
 	github.com/onsi/gomega v1.9.0 // indirect
 	github.com/oragono/confusables v0.0.0-20201108231250-4ab98ab61fb1

go.sum

 github.com/goshuirc/eventmgr v0.0.0-20170615162049-060479027c93/go.mod h1:bjJFM4iZJWTf9Rka9sNuI3GxszJqFeu5r1r15ZVtemo=
 github.com/goshuirc/irc-go v0.0.0-20201116034710-7e7b0985c4b5 h1:oqOT5hi8MRDGvfu4h7rlsrtper7I/0A41K0GppmBb5w=
 github.com/goshuirc/irc-go v0.0.0-20201116034710-7e7b0985c4b5/go.mod h1:q/JhvvKLmif3y9q8MDQM+gRCnjEKnu5ClF298TTXJug=
+github.com/goshuirc/irc-go v0.0.0-20201118022549-7209d10d54a8 h1:7vZqkY9bwimFNuLhWAzdxM9IM7ym853YLNhWsKAnsrQ=
+github.com/goshuirc/irc-go v0.0.0-20201118022549-7209d10d54a8/go.mod h1:q/JhvvKLmif3y9q8MDQM+gRCnjEKnu5ClF298TTXJug=
 github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=

vendor/github.com/goshuirc/irc-go/ircmsg/tags.go

 
 package ircmsg
 
-import "bytes"
 import "strings"
 
 var (
 // so you don't need to call it yourself after parsing a line.
 func UnescapeTagValue(inString string) string {
 	// buf.Len() == 0 is the fastpath where we have not needed to unescape any chars
-	var buf bytes.Buffer
+	var buf strings.Builder
 	remainder := inString
 	for {
 		backslashPos := strings.IndexByte(remainder, '\\')

vendor/modules.txt

 # github.com/gorilla/websocket v1.4.2
 ## explicit
 github.com/gorilla/websocket
-# github.com/goshuirc/irc-go v0.0.0-20201116034710-7e7b0985c4b5
+# github.com/goshuirc/irc-go v0.0.0-20201118022549-7209d10d54a8
 ## explicit
 github.com/goshuirc/irc-go/ircfmt
 github.com/goshuirc/irc-go/ircmsg