Merge pull request #87 from stoffu/aeon-readme-announce

Update readme to include link to announcement list /monero#3765

README.md

@@ -32,6 +32,9 @@ Portions Copyright (c) 2012-2013 The Cryptonote developers.
 - Our [Vulnerability Response Process](https://github.com/monero-project/meta/blob/master/VULNERABILITY_RESPONSE_PROCESS.md) encourages responsible disclosure
 - We are also available via [HackerOne](https://hackerone.com/monero)
 
+## Announcements
+
+- You can subscribe to an [announcement list](https://docs.google.com/forms/d/e/1FAIpQLSci2UitA67N0W_xgSPLlGj6acGnTOtTdDR_ODZwXTHXZsWnCQ/viewform) to get critical announcements from the Aeon core team. The announcement list can be very helpful for knowing when software updates are needed.
 
 ## Coverage