Allow automerging for Dependabot (#248)

Author: kubawerlos

.dependabot/config.yml

@@ -6,7 +6,11 @@ update_configs:
         update_schedule: 'live'
         default_assignees:
             - 'kubawerlos'
-        allowed_updates:
+        ignored_updates:
             -   match:
+                    dependency_name: 'php-cs-fixer/diff'
+        automerged_updates:
+            -   match:
+                    dependency_type: 'all'
                     update_type: 'all'
         version_requirement_updates: 'increase_versions'