Should AvroReflectDeepCopier require a public ctor ?

[Clément MATHIEU]

Hi,

I noticed that AvroReflectDeepCopier mandates a public no-arg ctor while 
most features don't care about ctor accessibility (ie. Avro reflect / 
deepCopy, ReflectionUtils etc.).

Is there a special reason to this ? If not, it seems like a two lines 
fix.

Thanks,
Clément