message: add package
  Fixes
diff: "vue": "^2.6.12",
  "vue-class-component": "^7.2.6",
  "vue-class-decorator": "^7.6.3",
  + "vue-fragment": "^1.5.2",
  "vue-loader": "^15.9.6",
  "vue-property-decorator": "^9.1.2",
  "vue-template-compiler": "^2.6.12",
  