Rename join to generateJoin

For consistency with other functions.

irc.go

@@ -300,7 +300,7 @@ type batch struct {
 	Label  string
 }
 
-func join(channels, keys []string) []*irc.Message {
+func generateJoin(channels, keys []string) []*irc.Message {
 	// Put channels with a key first
 	js := joinSorter{channels, keys}
 	sort.Sort(&js)

upstream.go

@@ -773,7 +773,7 @@ func (uc *upstreamConn) handleMessage(ctx context.Context, msg *irc.Message) err
 				keys = append(keys, ch.Key)
 			}
 
-			for _, msg := range join(channels, keys) {
+			for _, msg := range generateJoin(channels, keys) {
 				uc.SendMessage(ctx, msg)
 			}
 		}