Merge pull request #913 from readthedocs/davidfischer/fix-mailchimp-s…

…ignup

Fix Mailchimp email list signup

adserver/templates/adserver/email/publisher-payout.html

@@ -65,7 +65,7 @@
   If you want to keep up to date with the latest features and updates from EthicalAds,
   we recommend reading our <a href="https://www.ethicalads.io/blog/">blog</a> or <a href="https://twitter.com/ethicaladsio">Twitter</a>.
   If you prefer getting updates in your inbox,
-  you can subscribe to our <a href="https://ethicalads.us17.list-manage.com/subscribe/post?u=ca5e74de3ea2867d373058271&id=5746f18bb8">mailing list</a> as well.
+  you can subscribe to our <a href="https://mailchi.mp/ethicalads/mail-list-signup">mailing list</a> as well.
 </p>
 
 <p>