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Getting these errors with the plugin active on PHP 5.6

Strict Standards: Declaration of Axiom_Plugin_Updater::download_package() should be compatible with WP_Upgrader::download_package($package, $check_signatures = false, $hook_extra = Array) in /home/greenegr/public_html/wp-content/plugins/masterslider/admin/includes/classes/class-axiom-plugin-updater.php on line 29

Warning: Cannot modify header information – headers already sent by (output started at /home/greenegr/public_html/wp-content/plugins/masterslider/admin/includes/classes/class-axiom-plugin-updater.php:29) in /home/greenegr/public_html/wp-admin/includes/misc.php on line 1431

Warning: Cannot modify header information – headers already sent by (output started at /home/greenegr/public_html/wp-content/plugins/masterslider/admin/includes/classes/class-axiom-plugin-updater.php:29) in /home/greenegr/public_html/wp-includes/functions.php on line 6896

Warning: Cannot modify header information – headers already sent by (output started at /home/greenegr/public_html/wp-content/plugins/masterslider/admin/includes/classes/class-axiom-plugin-updater.php:29) in /home/greenegr/public_html/wp-admin/admin-header.php on line 9

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