v3.0.0

Breaking:

• Require Node.js 8 (#3) ba5f69c
• Convert the arguments to an options-object 9887e07
  monthDays(1, 2016); → monthDays({month: 1, year: 2016});

Enhancements:

• Add TypeScript definition (#3) ba5f69c

v2.1.0...v3.0.0