feat: update release notes

docs/RELEASE_NOTES.md

@@ -1,4 +1,4 @@
-#### 2.0.0-beta6 - Oct 1, 2022
+#### 2.0.0-beta7 - Apr 22, 2023
 - F# 6 task{} instead of async{} under thee hood - [#200](https://github.com/fsprojects/SwaggerProvider/pull/200)
 - BREAKING: `ProvidedApiClientBase.CallAsync` returns `task` instead of `async`
 - BREAKING: `task` CE wrap all exceptions in `AggregateException` (with `OpenApiException` inside)
@@ -7,6 +7,8 @@
 - Supported requests with `octet-stream` body content [#203](https://github.com/fsprojects/SwaggerProvider/pull/203)
 - Microsoft.OpenApi (1.4.3)
 - FSharp.SystemTextJson (1.0.5)
+- Removed the `System.Net.Http` dependency (#221)
+- fix: accept "default" as "ok response" fallback (#223)
 
 #### 1.0.2 - Jul 10, 2022
 - SharpYaml 2.0.0