New features

Fixes Drupal core issue:

#2816859: Allow the 'step' to be configured as a NumberWidget setting

Also, fixed:

#2940895: Update schema definition

Fixes following Drupal Commerce issues:

Updated Readme.md

Migrated to stable version of Bootstrap 4

Changed after last Beta 4 release:

This is a temporary development release so that the module is usable (via composer). There will be a new release soon (~2 weeks) with a lot of issue fixes and major refactoring.

This is maintenance release for Relation. No new major features but some some smaller improvements are included in addition to several bug fixes.