Fix details rendering for code security section

Author: johnthagen

README.md

@@ -213,6 +213,9 @@ make check-codestyle
 
 > Note: `check-codestyle` uses `isort`, `black` and `darglint` library
 
+</p>
+</details>
+
 <details>
 <summary>4. Code security</summary>
 <p>
@@ -230,9 +233,6 @@ make check-safety
 </p>
 </details>
 
-</p>
-</details>
-
 <details>
 <summary>5. Type checks</summary>
 <p>