2.0.1
We skipped 2.0 to go straight to 2.0.1
2.0.1
Fixed max retries for write conflicts
2.0
changed the default value of reject_zero in NotNull from True to False
added to_default function to reset a document to its default values
fixed bug in default documents where default values could be overwritten
default value for fields is now None
defaual value for fields can now be a callable