Use matterbridge vendored slack

vendor/github.com/nlopes/slack/examples/channels/channels.go

@@ -1,21 +0,0 @@
-package main
-
-import (
-	"fmt"
-
-	"github.com/nlopes/slack"
-)
-
-func main() {
-	api := slack.New("YOUR_TOKEN_HERE")
-	channels, err := api.GetChannels(false)
-	if err != nil {
-		fmt.Printf("%s\n", err)
-		return
-	}
-	for _, channel := range channels {
-		fmt.Println(channel.Name)
-		// channel is of type conversation & groupConversation
-		// see all available methods in `conversation.go`
-	}
-}