chore(package): update eslint to version 5.15.0

Closes #103

Author: greenkeeper[bot]

package.json

@@ -42,7 +42,7 @@
     "babel-preset-env": "^1.5.1",
     "babel-preset-es2015": "^6.22.0",
     "babel-preset-react": "^6.24.1",
-    "eslint": "^4.1.0",
+    "eslint": "^5.15.0",
     "eslint-config-hss": "^6.0.0",
     "eslint-config-prettier": "^2.0.0",
     "eslint-plugin-prettier": "^2.0.1",