Version bump to v3.1.5

Author: dannyvankooten

readme.txt

@@ -2,8 +2,8 @@
 Contributors: Ibericode, DvanKooten, hchouhan, lapzor
 Donate link: https://mc4wp.com/#utm_source=wp-plugin-repo&utm_medium=mailchimp-for-wp&utm_campaign=donate-link
 Tags: mailchimp, mc4wp, email, marketing, newsletter, subscribe, widget, mc4wp, contact form 7, woocommerce, buddypress, ibericode, mailchimp forms, mailchimp integrations
-Requires at least: 3.7
-Tested up to: 4.4
+Requires at least: 3.8
+Tested up to: 4.4.2
 Stable tag: 3.1.5
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html