chore: add mergify dismiss_reviews rule (#224)

Signed-off-by: campionfellin <campionfellin@gmail.com>

Author: campionfellin

.mergify.yml

@@ -11,3 +11,4 @@ pull_request_rules:
         strict_method: merge
         commit_message: title+body
       delete_head_branch: {}
+      dismiss_reviews: {}