CHANGELOG.md: update changelog

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
diff --git a/CHANGELOG.md b/CHANGELOG.md
index cec35f4..1977d65 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,7 @@
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 
-## [2.1.1]
+## [2.1.1] - 2019-02-04
 ### Fixed
 - Fixed leak of hkey on success in iesys_cryptossl_hmac_start
 - Fixed NULL ptr issues in Esys_HMAC_Start, Esys_HierarchyChangeAuth and Esys_NV_ChangeAuth