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Problem
phpspec was set in version ^4. This version was not compatible with
PHP 7.4. So if you have the latest version of PHP on your computer you
cannot develop on this plugin.
And the upgrade was blocking because of another dependency.
Solution
Update phpspec to ^6 version. Change phpspec-code-coverage to the
friends-of-phpspec version which allows us to use phpspec ^6.
Bonus
Add php 7.4 on travis ci.