Chore: upgrade ESLint to test

Author: mysticatea

package.json

@@ -21,9 +21,9 @@
     "babel-eslint": "^8.2.3",
     "codecov": "^3.0.1",
     "cross-spawn": "^6.0.5",
-    "eslint": "^4.19.1",
+    "eslint": "^5.0.0",
     "eslint-plugin-mysticatea": "^5.0.0-beta.5",
-    "eslint4b": "^4.19.2",
+    "eslint4b": "^5.0.0",
     "mocha": "^5.1.1",
     "nyc": "^11.7.1",
     "opener": "^1.4.3",