v2021.5.23
- doc - add section Changelog.
- doc - update README.md with installation instructions.
- cli - merge shell-function shJslintCli into jslint.js.
- jslint - update default globals with support for "import".
- jslint - sort warnings with higher priority for early_stop.
- jslint - add async/await support.
- ci - make branch-beta the default branch.
- ci - validate non-http/file links in *.md files.
- ci - add shell-functions shCiBranchPromote.