Update socket.io to latest patch release

services/real-time/npm-shrinkwrap.json

@@ -1,1897 +1,2652 @@
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 }

services/real-time/package.json

@@ -34,7 +34,7 @@
     "request": "^2.88.0",
     "session.socket.io": "^0.1.6",
     "settings-sharelatex": "^1.1.0",
-    "socket.io": "0.9.16",
+    "socket.io": "0.9.19",
     "socket.io-client": "^0.9.16"
   },
   "devDependencies": {