Update eslint to version 6.0.0 (#159)

Author: depfu[bot]

package.json

@@ -55,7 +55,7 @@
     "babel-jest": "24.8.0",
     "ejs": "^2.5.7",
     "ejs-lint": "^0.3.0",
-    "eslint": "^5.3.0",
+    "eslint": "^6.0.0",
     "eslint-config-airbnb-base": "^13.1.0",
     "eslint-config-prettier": "^4.1.0",
     "eslint-config-strict-react": "9.0.2",