v1.2.0

Implemented Enhancements

• Added Holiday Provider for Denmark
• Added Holiday Provider for Norway
• Added Holiday Provider for Sweden
• Added Holiday Provider for Finland
• New function 'isWorkingDay' added that determines whether a date represents a working day or not. A working day is
  considered a date that is neither a holiday nor falls into the weekend.
• Refactoring and cleanup of unit tests

Closed Issues

• The Vernal Equinox Day and Autumnal Equinox Day in Japan were excluded from having it substituted for another day in
  case these days would fall on the weekend.
• Fixed tests for some holiday providers as some holidays have been established only in a particular year, causing
  false failures in the unit tests.