ObjectParser did not support additionalProperties

[SixYearsInFebruary]

Thx for this repo. I used the yaml file which generated by openapi-generator-maven-plugin to start mock server. But the ObjectParse did not support additionalProperties. The modify of ObjectParse is below: if (schema.additionalProperties) { ret[chance.string()] = this.parser.parse(scheme); } Also need to modify the canParse method to support additionalProperties. @dzdrazil Thx