Travis checks failed #240
Description
Seems to happen because of the composer version:
$ composer install
Installing dependencies from lock file (including require-dev)
Verifying lock file contents can be installed on current platform.
Your lock file does not contain a compatible set of packages. Please run composer update.
More info:
You are using Composer 2, which some of your plugins seem to be incompatible with. Make sure you update your plugins or report a plugin-issue to ask them to support Composer 2.
The command "composer install" failed and exited with 2 during .
Possible solution (didn't test): composer self-update --1