Imagemagick 8.x-3.5

Support last imagemagick
https://www.drupal.org/project/imagemagick/releases/8.x-3.5 →

Problem 1
- Root composer.json requires drupal/imagemagick ^3.5 -> satisfiable by drupal/imagemagick[3.5.0, 3.x-dev].
- drupal/imagemagick[3.5.0, ..., 3.x-dev] require drupal/file_mdm ^3 -> found drupal/file_mdm[dev-3.0.x, 3.0.0-alpha1, ..., 3.0.x-dev (alias of dev-3.0.x)] but it conflicts with your root composer.json require (2.x-dev@dev).