chore(deps): update linters (#384)

Author: Renovate Bot

package.json

@@ -68,8 +68,8 @@
     "codecov": "^3.5.0",
     "cpy-cli": "^2.0.0",
     "delay": "^4.3.0",
-    "eslint": "^5.16.0",
-    "eslint-config-prettier": "^5.0.0",
+    "eslint": "^6.0.0",
+    "eslint-config-prettier": "^6.0.0",
     "eslint-plugin-node": "^9.1.0",
     "eslint-plugin-prettier": "^3.1.0",
     "express": "^4.17.1",