Added mirrors.rit.edu (#20037)

Author: KOLANICH

src/chrome/content/rules/RIT.edu.xml

@@ -119,6 +119,7 @@ Fetch error: http://ntid.rit.edu/ => https://ntid.rit.edu/: (51, "SSL: no altern
 	<target host="ill.rit.edu" />
 	<target host="library.rit.edu" />
 	<target host="my.rit.edu" />
+	<target host="mirrors.rit.edu" />
 	<target host="ntid.rit.edu" />
 	<target host="apps.ntid.rit.edu" />
 	<target host="www.ntid.rit.edu" />