bump package and close ws

package.json

@@ -1,6 +1,6 @@
 {
     "name"          : "node-red-contrib-web-worldmap",
-    "version"       : "1.0.31",
+    "version"       : "1.0.32",
     "description"   : "A Node-RED node to provide a web page of a world map for plotting things on.",
     "dependencies"  : {
         "express": "^4.15.0",

worldmap.js

@@ -71,7 +71,10 @@ module.exports = function(RED) {
                 client.disconnect(true);
             });
         }
-        node.on("close", function() { socket = null; });
+        node.on("close", function() {
+            socket.close();
+            socket = null;
+        });
         node.status({});
         socket.on('connection', callback);
     }