Update swagger-codegen command

Author: meliaj

README.md

@@ -69,7 +69,7 @@ except ApiException as e:
 
 3. Run this command in the swagger-codegen repo
 ```
-java -jar modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate -i $PATH_TO_SWAGGER_API_REPO/v1.2-client.yml -c $PATH_TO_THIS_REPO/override/config.json -l python -o $PATH_TO_THIS_REPO --additional-properties packageVersion=$VERSION
+java -jar modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate -i $PATH_TO_SWAGGER_API_REPO/v2.1-client.yml -l python -o $PATH_TO_THIS_REPO --additional-properties packageVersion=$VERSION
 ```
 
 4. Run `make override` to copy over the override files