bump: update @vue/cli-plugin-eslint version (#2327)

FIx  cannot find module '.../node_modules/eslint/lib/api.js/package.json' bug,see vuejs/vue-cli#4231.

Author: coin-monster

package.json

@@ -74,7 +74,7 @@
     "@babel/core": "7.0.0",
     "@babel/register": "7.0.0",
     "@vue/cli-plugin-babel": "3.5.3",
-    "@vue/cli-plugin-eslint": "3.5.1",
+    "@vue/cli-plugin-eslint": "^3.9.1",
     "@vue/cli-plugin-unit-jest": "3.5.3",
     "@vue/cli-service": "3.5.3",
     "@vue/test-utils": "1.0.0-beta.29",