Fixing reported issue between vue and jsdom

- Setting global.performance to window.performance.
- See vuejs/vue#9698

Author: Alex Perkins

package-lock.json

@@ -1,7 +1,7 @@
 {
   "name": "@rei/vunit",
   "description": "Write unit tests against your Vue components using mocha and vue-test-utils",
-  "version": "1.4.0",
+  "version": "1.4.1",
   "author": "Alex Perkins <[email protected]>",
   "repository": "https://github.com/rei/vunit",
   "license": "MIT",

package.json

@@ -2,7 +2,10 @@
 process.stdout.write('Setting up JSDOM...');
 require('jsdom-global')();
 
-// https://github.com/vuejs/vue-test-utils/issues/936#issuecomment-415386167
+// See https://github.com/vuejs/vue/issues/9698
+global.performance = window.performance;
+
+// See https://github.com/vuejs/vue-test-utils/issues/936#issuecomment-415386167
 window.Date = Date;
 
 if (window && window.document) {