Bump wordpress tested versino to 4.7.3

Author: benlk

readme.txt

@@ -3,7 +3,7 @@ Contributors: inn_nerds
 Donate link: https://inn.org/donate
 Tags: shortcode, iframe, javascript, embeds, responsive, pym, NPR
 Requires at least: 3.0.1
-Tested up to: 4.7.2
+Tested up to: 4.7.3
 Stable tag: 1.2.0
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html