Version v1.6.0 - Added new Hex method
Version v1.5.0 - Refactoring errors and tests
Version v1.4.0 - Added more helper methods
Version v1.3.0 - Added a new GUIDs type - list of global unique IDs
Version v1.2.0 - Added FromString
Version v1.1.1 - Removed UUID4 reference in comments and error message
Version v1.1.0 - Added IsNil method. Less strict UUID validation. Improved Valid method
Version v1.0.4 - Fixed error message for UUID4 format
Version v1.0.3 - Changed JSON null value as not present
Version v1.0.2 - Replaced GUID receiver from pointer to value
Version v1.0.1 - Fixed UnmarshalText function signature
Version v1.0.0 - First stable release