Just some minor changes and improvements.

 2021-11-16 [BUGFIX] Fix composer dependencies (Thanks to Christian Wolfram)
 2021-12-17 [BUGFIX] Fix parameter order in implode function (Thanks to Christian Wolfram)
 2022-06-02 [TASK] Update dev-dependency to cs-fixer (Thanks to Daniel Goerz)
 2022-06-07 [TASK] Remove require_dev section from composer.json
 2022-06-07 [TASK] 21 - Dont allow to add relations in MM_opposite_field