add suggests markdown

Author: sbgraves237

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: sos
 Title: Search Contributed R Packages, Sort by Package
 Version: 2.1-8
-Date: 2024-06-27
+Date: 2024-06-28
 Author: Spencer Graves [cre, aut, cph], 
     Sundar Dorai-Raj [aut], and Romain Francois [ctb]
 Maintainer: Spencer Graves <spencer.graves@prodsyse.com>
@@ -14,6 +14,7 @@ Suggests:
     testthat,
     knitr,
     rmarkdown
+    markdown
 Language: en-us
 URL: https://github.com/sbgraves237/sos
 BugReports: https://github.com/sbgraves237/sos/issues