Update readme.txt

Author: krinaydhanani

readme.txt

@@ -5,7 +5,7 @@ Donate link: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_i
 Tags: calendar, event, events, organizer, tickets
 Requires at least: 5.4.1
 Tested up to: 6.3.1
-Stable tag: 3.1.38
+Stable tag: 3.1.39
 Requires PHP: 5.6
 License: GPLv3
 License URI: https://www.gnu.org/licenses/gpl-3.0.html