romcal v1.3.0

romcal changed a lot since 1.2.4, therefore we list here only the main changes and small changes were combined. For more thorough list of changes, check the release notes for 1.3.0-beta.1, 1.3.0-beta.2, 1.3.0-beta.3, 1.3.0-rc.1 and 1.3.0-rc.2.

Revamp the code to use ES6 syntax.
Drop support for Node v4, v5.
Integrated module with std/esm to read .mjs files and babel to ensure compatibility and seamless usage with lower version of node and requiring via CommonJS.
Expose constants and calendar helper functions and via module exports.
Refactor rank types of celebrations (issue #109).

Introduce the new drop property that allows national calendars to omit unwanted celebrations from their output (issue #14).
Introduce new christmastideIncludesTheSeasonOfEpiphany flag to allow output to include or exclude the "season" of Epiphany from being merged into Christmastide.

Add Italian and Slovak locale files.
Some localization keys where renamed in order to confirm with official English names of the celebrations.

Update and simplify the build process.
Add automated build process to transpile the code after installing and before publishing.
Distribution files are now not included anymore in the codebase.
In addition to the romcal.bundle.min.js file (for browsers), source code is also transpiled by Babel and Webpack in the dist/ directory. This feature makes it possible to use romcal directly in the browser, so not only in a node.js package or environment (babel and webpack allow to have the same codebase for backend/node.js and frontend/browser).
Added more test cases for better test coverage.

Fix issue where calendar options always end up using their defaults even though an option has been specified
Various other bug, duplicate and typo fixes, and other improvements.

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