v4.0.0

IMask became recursive!
Nested masks now can be used with Pattern mask as independent blocks.

Pattern Groups were removed:

• instead MaskedPattern.PatternGroup.Range and MaskedPattern.PatternGroup.Enum use MaskedRange and MaskedEnum
• groups option renamed to blocks
• Date mask changed accordingly

All dependencies were updated, babel 7 is used.
Some bugs were fixed.
Many other internal changes and improvements.
That was a huge refactoring!