4.0.0

Implement ideas from RFC Enumerations:

• New: Add protected method match().
• New: Add factory method tryFrom().
• New: Add method getName().
• Chg: Remove immutability objects.
• Chg: Rename methods toObjects() to cases() and toValues() to values().
• Chg: Use private constants in enum object.
• Chg: On create object via method from() with invalid value throws ValueError instead UnexpectedValueException.