Changes between 1.14.0 and 1.15.0.RC1

This is a release candidate for 1.14.0, a maintenance release that includes a new feature and dependency upgrades. It is backward-compatible with 1.13.0. All users are encouraged to experiment with this pre-release or even better, test 2.1.0.RC1, as 1.x general support period ends on 31 July 2020.

Thanks to @sdurrenmatt for his contribution on this pre-release.