Fix sed regex as [a-Z] doesn't work with the latest version of sed

functions.sh

@@ -165,7 +165,7 @@ y" |									\
 function get_current_certificates () {
 
 	echo "Index     User <email address>"
-    grep ^V /var/lib/openvpn-server/openssl/index.txt | awk '{print $3 "/" $5}' | sed "s/[a-Z]*=//g" | awk -F "/" '{print $1 "\t" $6 " <" $7 ">"}'
+    grep ^V /var/lib/openvpn-server/openssl/index.txt | awk '{print $3 "/" $5}' | sed "s/[A-Za-z]*=//g" | awk -F "/" '{print $1 "\t" $6 " <" $7 ">"}'
 
 }