Merge pull request #27 from mbolivar/nrf52840

Nrf52840
diff --git a/README.md b/README.md
index 825174f..9ba5a08 100644
--- a/README.md
+++ b/README.md
@@ -41,4 +41,4 @@
 
 Developers welcome!  To join in the discussion, please join the developer mailing list: 
 
-https://runtimeco.mobilize.io/registrations/groups/9881
+http://lists.runtime.co/mailman/listinfo/dev-mcuboot_lists.runtime.co