Update linting packages (#375)

Co-authored-by: Renovate Bot <renovatebot@gmail.com>

Author: renovate[bot]

package-lock.json

@@ -25,9 +25,9 @@
   },
   "homepage": "https://0xtracker.com",
   "devDependencies": {
-    "eslint": "6.7.2",
+    "eslint": "6.8.0",
     "eslint-config-airbnb-base": "14.0.0",
-    "eslint-config-prettier": "6.7.0",
+    "eslint-config-prettier": "6.9.0",
     "eslint-plugin-import": "2.19.1",
     "eslint-plugin-prettier": "3.1.2",
     "husky": "2.4.1",