chore(package): update eslint to version 6.6.0

Closes #24

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
     "enzyme": "^3.3.0",
     "enzyme-adapter-react-16": "^1.1.1",
     "enzyme-to-json": "^3.3.4",
-    "eslint": "^5.0.0",
+    "eslint": "^6.6.0",
     "eslint-config-prettier": "^2.9.0",
     "eslint-plugin-flowtype": "^2.49.3",
     "eslint-plugin-import": "^2.12.0",