deps: upgrade to socket.io 2.0

NEWS.md

@@ -1,3 +1,16 @@
+2017-07-15
+==========
+
+The latest commit upgrades `socket.io` to version 2.0, a major version change
+from 1.4.  This release improves performance by switching to `uws` for the
+websocket transport, and fixes several bugs; you can read about it
+[here](https://github.com/socketio/socket.io/releases/tag/2.0.0).
+
+For browser clients, the upgrade should basically just work with no
+intervention.  For node.js clients, all that is needed is to upgrade
+`socket.io-client` to 2.0.  For other clients, work required may vary depending
+on whether the implementation has compatibility problems with 2.0.
+
 2017-06-20
 ==========
 

package.json

@@ -2,7 +2,7 @@
   "author": "Calvin Montgomery",
   "name": "CyTube",
   "description": "Online media synchronizer and chat",
-  "version": "3.40.1",
+  "version": "3.41.0",
   "repository": {
     "url": "http://github.com/calzoneman/sync"
   },
@@ -38,8 +38,7 @@
     "redis": "^2.4.2",
     "sanitize-html": "^1.14.1",
     "serve-static": "^1.10.0",
-    "socket.io": "^1.4.0",
+    "socket.io": "^2.0.3",
-    "socket.io-redis": "^1.0.0",
     "source-map-support": "^0.4.0",
     "sprintf-js": "^1.0.3",
     "status-message-polyfill": "git://github.com/calzoneman/status-message-polyfill",