chore(package): update eslint to version 5.15.2

Closes #75

Author: greenkeeper[bot]

package.json

@@ -62,7 +62,7 @@
     "conventional-changelog-cli": "^1.2.0",
     "coveralls": "^2.13.1",
     "cz-conventional-changelog": "^2.0.0",
-    "eslint": "^4.1.1",
+    "eslint": "^5.15.2",
     "eslint-plugin-ava": "^4.2.1",
     "eslint-plugin-react": "^7.1.0",
     "husky": "^0.14.3",