fix(package): update eslint to version 5.15.3

Closes #178

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
     "dotenv": "^6.0.0",
     "dotenv-expand": "4.2.0",
     "download.js": "^1.0.0",
-    "eslint": "5.0.0",
+    "eslint": "5.15.3",
     "eslint-config-airbnb": "^16.1.0",
     "eslint-config-prettier": "^3.0.0",
     "eslint-config-react-app": "^2.1.0",