chore(deps): update dependency eslint to v6 (#42)

Co-authored-by: WhiteSource Renovate <[email protected]>

Author: renovate[bot]

demo/package.json

@@ -19,7 +19,7 @@
     "@vue/cli-plugin-eslint": "^4.0.0",
     "@vue/cli-service": "^4.0.0",
     "babel-eslint": "^10.0.1",
-    "eslint": "^5.16.0",
+    "eslint": "^6.0.0",
     "eslint-plugin-vue": "^6.0.0",
     "vue-cli-plugin-i18n": "^0.6.0",
     "vue-template-compiler": "^2.6.10"