Merge pull request #1 from lperichon/master

order attributes with primary first
VERSION 0.0.2
[#40582341] add age to client
[#40582341] VERSION 0.0.3
[#42506283] added estimated age
[#42506283] removed attribute_key of estimated_age
Merge pull request #2 from afalkear/master

Added EstimatedAge
[#40582341] birthday category name is birthday, not birth_day
VERSION 0.0.4
version 0.0.5
[#42506283] added EstimatedAge class
Merge pull request #3 from afalkear/master

Added EstimatedAge class
v 0.0.6
Added missing validator