Merge branch 'drupal9'

* drupal9:
  Adjusted reference to dev release
  Switched to dev version of monolog module
  Updated dependecies to drupal 9 support. @todo Test logging

Author: stankut

composer.json

@@ -7,6 +7,6 @@
     "license": "EUPL-1.2",
     "require": {
         "drupal/date_popup": "^1.1",
-        "drupal/monolog": "^1.3"
+        "drupal/monolog": "2.x-dev"
     }
 }