bump stable tag to 1.6.1

Author: stklcode

README.md

@@ -8,7 +8,7 @@
 * Requires at least: 4.7
 * Tested up to:      5.7
 * Requires PHP:      5.5
-* Stable tag:        1.6.0
+* Stable tag:        1.6.1
 * License:           GPLv2 or later
 * License URI:       https://www.gnu.org/licenses/gpl-2.0.html