Fixed lint error on CI (#1008)

Author: ota-meshi

package.json

@@ -56,8 +56,9 @@
     "chai": "^4.1.0",
     "eslint": "^6.0.0",
     "eslint-plugin-eslint-plugin": "^2.0.1",
-    "eslint-plugin-vue-libs": "^4.0.0",
+    "eslint-plugin-import": "^2.18.2",
     "eslint-plugin-vue": "file:.",
+    "eslint-plugin-vue-libs": "^4.0.0",
     "eslint4b": "^6.6.0",
     "lodash": "^4.17.4",
     "mocha": "^5.2.0",