chore(package): update eslint to version 6.1.0

Closes #34

Author: greenkeeper[bot]

package.json

@@ -62,7 +62,7 @@
     "@typescript-eslint/eslint-plugin": "^1.2.0",
     "@typescript-eslint/parser": "^1.2.0",
     "codecov": "^3.1.0",
-    "eslint": "^5.9.0",
+    "eslint": "^6.1.0",
     "eslint-config-airbnb-base": "^13.1.0",
     "eslint-plugin-import": "^2.14.0",
     "husky": "^1.2.0",