Update docker file

Dockerfile

@@ -4,5 +4,7 @@ RUN mkdir -p /go/src/github.com/giongto35/game-online
 COPY . /go/src/github.com/giongto35/game-online/
 
 # Install server dependencies
+RUN apt-get install portaudio19-dev
 RUN go get github.com/pions/webrtc
 RUN go get github.com/gordonklaus/portaudio
+RUN go get github.com/gorilla/mux

main.go

@@ -3,10 +3,8 @@ package main
 import (
 	"fmt"
 	"image"
-	"image/color"
 	"io/ioutil"
 	"log"
-	"math/rand"
 	"net/http"
 	"time"
 
@@ -68,17 +66,6 @@ func postSession(w http.ResponseWriter, r *http.Request) {
 	w.Write([]byte(localSession))
 }
 
-func randomImage(width, height int) *image.RGBA {
-	img := image.NewRGBA(image.Rectangle{image.Point{0, 0}, image.Point{width, height}})
-	for x := 0; x < width; x++ {
-		for y := 0; y < height; y++ {
-			img.Set(x, y, color.RGBA{uint8(rand.Int31n(0xff)), uint8(rand.Int31n(0xff)), uint8(rand.Int31n(0xff)), 0xff - 1})
-		}
-	}
-
-	return img
-}
-
 func screenshotLoop(imageChannel chan *image.RGBA) {
 	for image := range imageChannel {
 		if webRTC.IsConnected() {