Update README

2021-02-01 23:18:51 +00:00 · 2021-02-01 23:18:51 +00:00 · a0db96d3e1
--- a/README.md
+++ b/README.md
@ -1,7 +1,10 @@
 # mail.dumpstack.io

+[Download NixOS installation ISO](https://nixos.org/nixos/download.html)
+
 Note:
-1. Some cloud providers disallow outbound SMTP by default. Check it if
+1. I assume that latest **stable** (e.g. 20.09) ISO will be used for installation.
+2. Some cloud providers disallow outbound SMTP by default. Check it if
   there'll be issues with outgoing emails.

 ## Installation