chore(package): update eslint to version 6.8.0

Closes #47

Author: greenkeeper[bot]

package.json

@@ -28,7 +28,7 @@
   },
   "devDependencies": {
     "babel-eslint": "^8.2.6",
-    "eslint": "^5.3.0",
+    "eslint": "^6.8.0",
     "eslint-config-fresh": "^3.0.0",
     "eslint-config-xo-react": "^0.17.0",
     "eslint-config-xo-space": "^0.20.0",