Update RELEASE_NOTES

Co-authored-by: Bhuvnesh Chaudhary <bchaudhary@pivotal.io>
diff --git a/RELEASE_NOTES b/RELEASE_NOTES
index 8db41da..62c3bca 100644
--- a/RELEASE_NOTES
+++ b/RELEASE_NOTES
@@ -12,7 +12,7 @@
 —-------------------------------------------------------------------------
 MADlib v1.19.0:
 
-Release Date: 2022-Jan-XX
+Release Date: 2022-March-XX
 
 NOTE: This release changes MADlib library location and updates UDF definitions.
 To ensure this change is reflected in the database, pg_ctl (for Postgres) or gpstop (for Greenplum) has to be in the PATH at the time of madpack installation.
@@ -33,11 +33,13 @@
     - DL: Fix object table schema error message
     - DL: Fix metrics error message
     - DL: Remove AOcontrol from load_top_k_accuracy fn
+    - GLM-multinom: Use non-temp tables in GroupIterationController
 
 Other:
     - DEBUG: Add WithTracebackForwarding() macro and report_segment_tracebacks param
     - Jenkins: Add new dockerfile for PG11 (MADLIB-1469)
     - Build: Use dynamic_library_path for module pathname
+    - Mac OS support is dropped until further notice
 
 —-------------------------------------------------------------------------
 MADlib v1.18.0: