Add Powered by Bintray banner

Update chromebrew and banner urls

Update banner image url

Link banner image url

README.md

@@ -81,3 +81,7 @@ License
 Copyright 2013-2018 Michal Siwek and [all the awesome contributors](https://github.com/skycocker/chromebrew/graphs/contributors).
 
 This project including all of its source files is released under the terms of [GNU General Public License (version 3 or later)](http://www.gnu.org/licenses/gpl.txt).
+
+Our binary packages are hosted on [bintray](https://bintray.com/chromebrew/chromebrew).
+
+<a href="https://bintray.com/chromebrew/chromebrew" target="_blank"><img src="https://github.com/skycocker/chromebrew/blob/master/images/Powered-by-Bintray_Banner_16-6-16-green.png" alt="Powered by Bintray" /></a>