Update CHANGELOG

Author: josevalim

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 Elixir v1.12 is out with improvements to scripting, tighter Erlang/OTP 24 integration, stepped ranges, and dozen of new functions across the standard library. Overall this is a small release, which continues our tradition of bringing Elixir developers quality of life improvements every 6 months.
 
-Elixir v1.12 requires Erlang/OTP 22+.
+Elixir v1.12 requires Erlang/OTP 22+. We also recommend running `mix local.rebar` after installation to upgrade to the latest Rebar versions, which includes support for Erlang OTP/24+.
 
 ## Scripting improvements: `Mix.install/2` and `System.trap_signal/3`