Prepare change log entry for v2.4.1

Build the library for v2.4.0

Add a change log entry for v2.3.0

Fix typings in set

Disable auto tweet

Add changelog entry for v2.1.0

Update README

- Add note about the upgrade docs
- Add note about upgrade tools
- Add jobs plug

Update the changelog

addBusinessDays negative amount fix, performance fixes for addBusines…

…sDays and differenceInBusinessDays (date-fns#1286)

Build the package