Svix

* Kotlin: Ensure response bodies are properly closed 🐞

* All: Add new `ServerUrl` option for overriding the APIs base URL (Useful for testing) 🆕

* All: Support for `payload_retention_period` in message API. 🆕

* Ruby: Upgrade to bundler 2 🆕
* Ruby: Fix endpoint.update parameters 🐞 (thanks [sevensidedmarble](https://github.com/sevensidedmarble)!)
* Go: Add ability to verify webhook payloads while ignoring timestamp enforcement ❌🕝
* Go: Regenerate OpenAPI Spec

* All: Add support for retrieving a single event type 🆕
* Javascript: Add readme for npm 📚
* Ruby: Fix base64 import on case-sensitive file systems 🐞 (thanks [mikelarkin](https://github.com/mikelarkin)!)

* All: Add support for custom endpoint header API 🆕