chore(package): update eslint to version 5.15.0

Closes #24

Author: greenkeeper[bot]

package.json

@@ -55,7 +55,7 @@
     "babel-plugin-inline-import": "^2.0.6",
     "cpy-cli": "^1.0.1",
     "del-cli": "^1.1.0",
-    "eslint": "^4.15.0",
+    "eslint": "^5.15.0",
     "eslint-config-airbnb-base": "^12.1.0",
     "eslint-config-prettier": "^2.3.0",
     "eslint-plugin-import": "^2.7.0",