Version 0.3.0

• Added MustRanges and MustRange helper functions to panic at non-nil error.
• Removed MustBetween, MustStratify, MustSplit methods.
• Removed impossible case at Truncate method - default with panic.

Version 0.2.0

• Between, Split, Stratify methods now return errors, instead of panicking.
• Added Must versions of methods above.

initial release

• Added Range type.
• Added methods
  • to merge overlapping ranges;
  • flip them in the defined period;
  • truncate;
  • stratify;
  • split.