Add StandardJS workflow

Been running these locally only.

examples/reflect/jsfiddle/demo.js

@@ -1,19 +1,19 @@
 /* eslint-env browser */
 
-let pc = new RTCPeerConnection({
+const pc = new RTCPeerConnection({
   iceServers: [
     {
       urls: 'stun:stun.l.google.com:19302'
     }
   ]
 })
-var log = msg => {
+const log = msg => {
   document.getElementById('logs').innerHTML += msg + '<br>'
 }
 
 navigator.mediaDevices.getUserMedia({ video: true, audio: true })
   .then(stream => {
-    stream.getTracks().forEach(track => pc.addTrack(track, stream));
+    stream.getTracks().forEach(track => pc.addTrack(track, stream))
     pc.createOffer().then(d => pc.setLocalDescription(d)).catch(log)
   }).catch(log)
 
@@ -24,7 +24,7 @@ pc.onicecandidate = event => {
   }
 }
 pc.ontrack = function (event) {
-  var el = document.createElement(event.track.kind)
+  const el = document.createElement(event.track.kind)
   el.srcObject = event.streams[0]
   el.autoplay = true
   el.controls = true
@@ -33,7 +33,7 @@ pc.ontrack = function (event) {
 }
 
 window.startSession = () => {
-  let sd = document.getElementById('remoteSessionDescription').value
+  const sd = document.getElementById('remoteSessionDescription').value
   if (sd === '') {
     return alert('Session Description must not be empty')
   }
@@ -59,4 +59,3 @@ window.copySDP = () => {
     log('Unable to copy SDP ' + err)
   }
 }
-