README: Add missing date to CHANGELOG

README: Add missing date to CHANGELOG

diff --git a/CHANGELOG b/CHANGELOG
index 2e2c8cf..3f68156 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,5 @@
+07-05-2020
+
 - Version 3.2.0
 
    - FIX: compatability with Rails 6.0.3, note: apps without ActionDispatch::Flash may stop working after this upgrade

GitHub sha: c02edbef

This commit appears in #222 which was merged by SamSaffron.