Update README.md

Co-authored-by: Michaël Zasso <targos@protonmail.com>

Author: Trott

README.md

@@ -669,6 +669,8 @@ use these keys to verify a downloaded file.
 
 <details>
 
+<summary>Other keys used to sign some previous releases:</summary>
+
 Other keys used to sign some previous releases:
 
 * **Chris Dickinson** &lt;christopher.s.dickinson@gmail.com&gt;