Builder should respect @NonNull annotation.

[patientstreetlight]

In the version of lombok-pg I'm using (0.11.3), Builder will allow fields which are marked @NonNull to be initialized to null, as demonstrated below. If possible, I think Builder should do a runtime check to ensure that the object passed in is indeed not null, just like @Setter does.

import lombok.Builder;
import lombok.NonNull;
import lombok.Getter;

@Builder
@Getter
class Foo {
    @NonNull private final String bar;

    public static void main(String[] args){
        Foo f = Foo.foo().bar(null).build();  // Does *not* throw NullPointerException
        System.out.println(f.getBar()); // Prints null.
    }
}

I am aware of a similar-sounding issue, #54. However that issue seems to indicate that fields marked @NonNull should be mandatory fields (just like final fields), but does not mention that the Builder should actually do the null check.

[nicholas22]

If you could provide a fix, I will merge