0.2.0

1. Support dynamic Stripe key via msg.apiKey #4
2. Fixes a bug that idempotencyKey will have Stripe API ignoring the whole parameter object. #5
3. Upgrade to stripe@^8.14.0

Upgrade stripe version

Upgrade stripe to 7.4.0 (#3)

* Update packages and version bump
* Support multiple levels of object nesting
* Update function dropdown for Stripe API 7.4.0
* Use ES6 syntax