Update CHANGELOG

Signed-off-by: Jared Ledvina <jared@techsmix.net>

CHANGELOG.md

@@ -6,7 +6,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/).
 
 ## [Unreleased]
 ## Changed
-- Update all package URLs to new EOL domain (@mho-CL & @jaredledvin)
+- Update all package URLs to new EOL domain (@mho-CL & @jaredledvina)
+- Update README with EOL status of Sensu Core (@jaredledvina)
 
 ## [5.4.0] - 2019-07-20
 ## Changed