Add equalizer info to state response

resolves #472
Use discovery v1.4.1

Author: jishi

package.json

@@ -1,6 +1,6 @@
 {
   "name": "sonos-http-api",
-  "version": "1.4.0",
+  "version": "1.4.1",
   "description": "A simple node app for controlling a Sonos system with basic HTTP requests",
   "scripts": {
     "start": "node server.js"
@@ -18,7 +18,7 @@
     "json5": "^0.5.1",
     "node-static": "~0.7.0",
     "request-promise": "~1.0.2",
-    "sonos-discovery": "https://github.com/jishi/node-sonos-discovery/archive/v1.4.0.tar.gz"
+    "sonos-discovery": "https://github.com/jishi/node-sonos-discovery/archive/v1.4.1.tar.gz"
   },
   "engines": {
     "node": ">=4.0.0",