Added note to README about supported OpenAPI versions. Closes #176

Author: dbanty

CHANGELOG.md

@@ -15,6 +15,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Properly remove spaces from generated Enum keys (#198). Thanks @bowenwr!
 
+### Added
+
+- Note to README about supported OpenAPI versions (#176). Thanks @filippog!
+
 ## 0.6.0 - 2020-09-21
 
 ### Breaking Changes

README.md

@@ -7,7 +7,10 @@
 
 # openapi-python-client
 
-Generate modern Python clients from OpenAPI
+Generate modern Python clients from OpenAPI 3.x documents.
+
+_This generator does not support OpenAPI 2.x FKA Swagger. If you need to use an older document, try upgrading it to
+version 3 first with one of many available converters._
 
 **This project is still in development and does not support all OpenAPI features**