Update README

fizzed · Oct 2, 2017 · ae6485a · ae6485a
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@@ -8,9 +8,9 @@ Sponsored by
 
 Cloudhopper-SMPP is proudly sponsored by <a href="https://www.greenback.com">Greenback</a>.  We love the service and think you would too.
 
-<a href="https://www.greenback.com" title="Greenback - Expenses made simple"><img src="https://www.greenback.com/assets/images/logo-greenback.png" height="48" width="166" alt="Greenback"></a>
+<a href="https://www.greenback.com?utm_source=github.com&utm_medium=sponsorship&utm_campaign=fizzed-cloudhopper-smpp" title="Greenback - Expenses made simple"><img src="https://www.greenback.com/assets/images/logo-greenback.png" height="48" width="166" alt="Greenback"></a>
 
-<a href="https://www.greenback.com" title="Greenback - Expenses made simple">More engineering. Less paperwork. Expenses made simple.</a>
+<a href="https://www.greenback.com?utm_source=github.com&utm_medium=sponsorship&utm_campaign=fizzed-cloudhopper-smpp" title="Greenback - Expenses made simple">More engineering. Less paperwork. Expenses made simple.</a>
 
 Overview
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