ci: use eslint@5 at root level, fix ci issues

Author: haoqunjiang

package.json

@@ -47,7 +47,7 @@
     "babel-core": "7.0.0-bridge.0",
     "conventional-changelog": "^1.1.24",
     "debug": "^3.1.0",
-    "eslint": "^4.16.0",
+    "eslint": "^5.0.0",
     "eslint-plugin-graphql": "^2.1.1",
     "eslint-plugin-node": "^6.0.1",
     "eslint-plugin-vue-libs": "^2.1.0",