message: Add decade helpers to the docs groups [skip ci]
diff: @@ -18,7 +18,8 @@ module.exports = {
  'Month Helpers',
  'Quarter Helpers',
  'Year Helpers',
  - 'ISO Week-Numbering Year Helpers'
  + 'ISO Week-Numbering Year Helpers',
  + 'Decade Helpers'
  ],
  staticDocs: [
  