Use matterbridge vendored slack

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

@@ -1,54 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"log"
-	"os"
-
-	"github.com/nlopes/slack"
-)
-
-func main() {
-	api := slack.New("YOUR TOKEN HERE")
-	logger := log.New(os.Stdout, "slack-bot: ", log.Lshortfile|log.LstdFlags)
-	slack.SetLogger(logger)
-	api.SetDebug(true)
-
-	rtm := api.NewRTM()
-	go rtm.ManageConnection()
-
-	for msg := range rtm.IncomingEvents {
-		fmt.Print("Event Received: ")
-		switch ev := msg.Data.(type) {
-		case *slack.HelloEvent:
-			// Ignore hello
-
-		case *slack.ConnectedEvent:
-			fmt.Println("Infos:", ev.Info)
-			fmt.Println("Connection counter:", ev.ConnectionCount)
-			// Replace #general with your Channel ID
-			rtm.SendMessage(rtm.NewOutgoingMessage("Hello world", "#general"))
-
-		case *slack.MessageEvent:
-			fmt.Printf("Message: %v\n", ev)
-
-		case *slack.PresenceChangeEvent:
-			fmt.Printf("Presence Change: %v\n", ev)
-
-		case *slack.LatencyReport:
-			fmt.Printf("Current latency: %v\n", ev.Value)
-
-		case *slack.RTMError:
-			fmt.Printf("Error: %s\n", ev.Error())
-
-		case *slack.InvalidAuthEvent:
-			fmt.Printf("Invalid credentials")
-			return
-
-		default:
-
-			// Ignore other events..
-			// fmt.Printf("Unexpected: %v\n", msg.Data)
-		}
-	}
-}