[danger] Added detection of # in PR-body (fastlane#4985)

Dangerfile

@@ -8,7 +8,9 @@ if pr_body.length < 5
   warn("Please provide a changelog summary in the Pull Request description @#{pr_author}")
 end
 
-unless pr_title.downcase.include?('version bump') || pr_body.include?("https://github.com/fastlane/fastlane/issues/")
+if !pr_title.downcase.include?('version bump') &&
+   !pr_body.include?("https://github.com/fastlane/fastlane/issues/") &&
+   pr_body.match(/#\d+/).nil?
   warn("Before submitting a Pull Request, please create an issue on GitHub to discuss the change. Please add a link to the issue in the PR body.")
 end