As a start, I've added an entry for #120 for the upcoming 4.0 release. Please feel free to add feedback for additional BC breaking changes that need to be in this file!
I also updated the existing README files and advertised the UPGRADING.md.
Coverage remained the same at 66.682% when pulling 2ab47621c4b64121dfc166a6b5298ea4ee0bf973 on MKodde:feature/introduce-upgrading-documentation into 1e67636360d7062b4e677cea9602a56198aceba3 on simplesamlphp:master.
See #164 for a motivation for this PR.
As a start, I've added an entry for #120 for the upcoming 4.0 release. Please feel free to add feedback for additional BC breaking changes that need to be in this file!
I also updated the existing README files and advertised the UPGRADING.md.