Adds python-experimental to the users list

Author: spacether

.idea/.gitignore

@@ -286,6 +286,7 @@ Node-specific support is maintained in a [separate repository](https://github.co
 * [fastjsonschema](https://github.com/seznam/python-fastjsonschema)
 * [hypothesis-jsonschema](https://github.com/Zac-HD/hypothesis-jsonschema)
 * [jschon](https://github.com/marksparkza/jschon)
+* [python-experimental, OpenAPI Generator](https://github.com/OpenAPITools/openapi-generator/blob/master/docs/generators/python-experimental.md)
 
 ### Ruby