Finally fix dev tags according to https://www.drupal.org/node/2757685

composer.json

@@ -40,10 +40,10 @@
     "drupal/video": "1.2",
     "drupal/videojs": "1.0",
     "drupal/metatag": "1.x-dev",
-    "drupal/slack": "1.0.x-dev",
+    "drupal/slack": "1.x-dev",
     "drupal/honeypot": "1.23",
     "drupal/maillog": "1.x-dev",
-    "drupal/contact_storage": "1.0.x-dev",
+    "drupal/contact_storage": "1.x-dev",
     "drupal/field_group": "1.x-dev",
     "drupal/ds": "2.4"
   },