Updates composer dependencies, and specifically bumps WP_Mock to latest version usable on PHP 7.2 (see commit ba5cdfa for details)
Adds a changelog
Makes some of the unit tests less brittle by loosening the specs they apply. This follows recent experience on e.g. rebuilding the dxw website theme, where people were regularly encountering failing tests due to config changes like amending image sizes.
This PR:
ba5cdfafor details)