Bump latest working WordPress version.

Author: rolftimmermans

readme.txt

@@ -3,7 +3,7 @@ Contributors: TinyPNG
 Donate link: https://tinypng.com/
 Tags: optimize, compress, shrink, resize, faster, fit, scale, improve, images, tinypng, tinyjpg, jpeg, jpg, png, lossy, jpegmini, crunch, minify, smush, save, bandwidth, website, speed, performance, panda, wordpress app
 Requires at least: 3.0.6
-Tested up to: 4.4
+Tested up to: 4.5
 Stable tag: 1.7.0
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html