Announcement (a bit late): moved to a `tunnckoCore/opensource` monorepo

[tunnckoCore]

Since the last GitHub Release (tag, npm version) here which is 5.2.11 & 5.2.12 the project has moved to https://github.com/tunnckoCore/opensource at packages (or @packages) workspace. Please open PRs and issues there, the npm package is also is pointing to the correct location.

Any minor & patch version from those until the v6 (which is in the works at tunnckoCore/opensource#67) are just misc stuff and nothing important - they are because the monorepo stuff and maintenance, but nothing special to the codebase or any meaningful changes impacting you. In addition, there may be some broken versions that are missing dist files and such. Just upgrade to the latest version.

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todo (for me): move the issues there