Merge pull request #14918 from SMillerDev/master

bump-formula-pr: add release notes if found

Library/Homebrew/dev-cmd/bump-formula-pr.rb

@@ -346,6 +346,28 @@ def bump_formula_pr
       EOS
     end
 
+    if new_url =~ %r{^https://github\.com/([\w-]+)/([\w-]+)/archive/refs/tags/(v?[.0-9]+)\.tar\.}
+      owner = Regexp.last_match(1)
+      repo = Regexp.last_match(2)
+      tag = Regexp.last_match(3)
+      github_release_data = begin
+        GitHub::API.open_rest("#{GitHub::API_URL}/repos/#{owner}/#{repo}/releases/tags/#{tag}")
+      rescue GitHub::API::HTTPNotFoundError
+        # If this is a 404: we can't do anything.
+        nil
+      end
+
+      if github_release_data.present?
+        pre = "pre" if github_release_data["prerelease"].present?
+        pr_message += <<~XML
+          <details>
+            <summary>#{pre}release notes</summary>
+            #{github_release_data["body"]}
+          </details>
+        XML
+      end
+    end
+
     pr_info = {
       sourcefile_path:  formula.path,
       old_contents:     old_contents,