by Michael Bornand: compatibility with Drupal post 8.3.0

composer.json

@@ -10,8 +10,8 @@
     "minimum-stability": "dev",
     "name": "drupal/reinstall",
     "require": {
-        "drupal/migrate_plus": "^2.0",
-        "drupal/migrate_tools": "^3.0@RC"
+        "drupal/migrate_plus": "^4.0@beta",
+        "drupal/migrate_tools": "^4.0"
     },
     "type": "drupal-module"
 }