Update karma version

Author: alancutter

Diff for: Gruntfile.js

@@ -191,10 +191,9 @@ module.exports = function(grunt) {
     return new Promise(function(resolve) {
       var karmaConfig = require('karma/lib/config').parseConfig(require('path').resolve('test/karma-config.js'), {});
       configCallback(karmaConfig);
-      var karmaServer = require('karma').server;
-      karmaServer.start(karmaConfig, function(exitCode) {
+      new (require('karma').Server)(karmaConfig, function(exitCode) {
         resolve(exitCode == 0);
-      });
+      }).start();
     });
   }