[JAVA] serializableModel Parameter is not working

Description

Hey! I'm trying to set up a serializable Model with the codegen, but I can't really figure out how to pass the parameter correctly. Any ideas what I'm doing wrong?

Swagger-codegen version

2.4.0

Command line used for generation

PS C:\xxx\xxx\xxx\xxx\Projects\swagger-codegen> java -jar modules\swagger-codegen-cli\target\swagger-codegen-cli.jar generate -i https://xxxxx/swagger.json -l java --library=retrofit2 --serializableModel=true -o C:\xxx\xxx\xxx\xxx\Projects\javaapi

Exception in thread "main" io.airlift.airline.ParseArgumentsUnexpectedException: Found unexpected parameters: [--serializableModel=true]
        at io.airlift.airline.Cli.validate(Cli.java:148)
        at io.airlift.airline.Cli.parse(Cli.java:116)
        at io.airlift.airline.Cli.parse(Cli.java:97)
        at io.swagger.codegen.SwaggerCodegen.main(SwaggerCodegen.java:35)

Steps to reproduce

Using the above statement does not work.

Start at SwaggerCodegen.main and the generate-command option parsing, reproducing the supplied command with --serializableModel=true. Check the supported spelling and boolean syntax for serializableModel, then verify that a generated Java client contains serializable models; done means the command is accepted and the option has the expected effect.