Change test command in package.json

Remove last mention of vue-cli

package.json

@@ -5,7 +5,7 @@
   "scripts": {
     "serve": "cross-env NODE_ENV=development webpack serve",
     "build": "cross-env NODE_ENV=production webpack serve",
-    "test:unit": "vue-cli-service test:unit",
+    "test:unit": "jest",
     "lint": "eslint --ext .ts src/",
     "ci": "npm run lint && npm run test:unit"
   },