NoSuchMapperException in a derived class

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Hi,

i have this model:

```
@JsonObject
public class ValidationErrorsModel {

@SerializedName("validation_errors")
@JsonField(name = "validation_errors")
public SimpleArrayMap> validationErrors;
}
```

and i have another one that extends it:

```
@JsonObject
public class UserCreateModel extends ValidationErrorsModel
```

but it appears this error:

```
Caused by: com.bluelinelabs.logansquare.NoSuchMapperException: Class io.swagger.client.model.ValidationErrorsModel could not be mapped to a JSON object. Perhaps it hasn't been annotated with @JsonObject?
at com.bluelinelabs.logansquare.LoganSquare.mapperFor(LoganSquare.java:304)
at io.swagger.client.model.UserCreateModel$$JsonObjectMapper.(UserCreateModel$$JsonObjectMapper.java:15)
```

any idea how can i solve it?

Thanks

Start with LoganSquare.mapperFor(LoganSquare.java:304) and the generated UserCreateModel$$JsonObjectMapper, where the exception occurs. Reproduce the inheritance case using the ValidationErrorsModel and UserCreateModel shown in the report, then trace how annotated base classes are resolved. Done means the derived model maps successfully without NoSuchMapperException and the behavior is covered by a regression test.

Written by the indexing model from the issue text.