* Support multiple annotations #248  (#273)

* Fix request serialization if null input was supplied #271

* Support multiple annotations #248

* Update docs

* Remove generateAsyncApi, rename apiReturnType, apiReturnListType #269 (#274)

* Remove generateAsyncApi, rename apiReturnType, apiReturnListType #269

* Introduce config useOptionalForNullableReturnTypes #269

* Update migration guide #269

* Ability to generate only root interface with all apis #270 (#275)

* Bump version to 3.0.0-SNAPSHOT