Modify release-log.txt to sign 5.2.1 is ready.
diff --git a/release-log.txt b/release-log.txt
index e18ca4f..7db659d 100644
--- a/release-log.txt
+++ b/release-log.txt
@@ -1,4 +1,4 @@
--- Oozie 5.2.1 release (unreleased)
+-- Oozie 5.2.1 release
 
 OOZIE-3601 Upgrade quartz to 2.3.2 (dengliming via matijhs)
 OOZIE-3549 Add back support for truststore passwords (matijhs via asalamon74)