Add gpg fingerprint

Change-Id: I08edec9e2567cf282d8a7364c74541798ed5a537
diff --git a/releases/public-keys.md b/releases/public-keys.md
index b9f8fcc..fa84b8e 100644
--- a/releases/public-keys.md
+++ b/releases/public-keys.md
@@ -6,3 +6,4 @@
 | Name             | Email Address          | Fingerprint                                        |
 |------------------|------------------------|----------------------------------------------------|
 | David Pursehouse | dpursehouse@collab.net | 0A76 9EB0 5339 B93B DD89  95ED 0C3A F664 9FFC 2102 |
+| Saša Živkov      | sasa.zivkov@sap.com    | 024B 9991 1E26 0764 22A7  5AD4 4D52 61F9 26C1 290E |