Optional value (ptr) via env

[DHorrible]

Hello, I have used the lib for building config from env and a file. If I created field as pointer then I thought that it is as optional and it is not bound (nil value). When I set value for pointer field in a config file my logic is gone well, but if I set via env variable then my program throw exception ("unsupported type .")

type Config struct {
  optField *MyField `env:"OPT_VALUE"`
}

I think that 'cleanenv' have to implement same logic with env that a config file and this way not provide an unexpected error.