Release: Update RELEASE_NOTES for v1.13

JIRA: MADLIB-1189
diff --git a/RELEASE_NOTES b/RELEASE_NOTES
index 5bd7820..eed2a08 100644
--- a/RELEASE_NOTES
+++ b/RELEASE_NOTES
@@ -11,9 +11,30 @@
 —-------------------------------------------------------------------------
 MADlib v1.13:
 
-Release Date: TBD
+Release Date: 2017-December-22
 
-* Updated PyXB from 1.2.4 to 1.2.6.
+New features:
+* New module: Graph - HITS (MADLIB-1124, MADLIB-1151)
+* k-NN:
+    - Added additional distance metrics (MADLIB-1059)
+    - Added list of neighbors in output table (MADLIB-1129)
+* MLP: Added grouping support (MADLIB-1149)
+* Cross Validation: Improved the stats reporting in output table (MADLIB-1169)
+* Correlation: Improved quality of results by ignoring only a NULL value and
+    not the whole row containing the NULL (MADLIB-1166)
+
+Bug fixes:
+    - Fixed issue with Decision Trees (DT) trained in older versions not
+        being usable in predict of v1.12 (MADLIB-1161)
+    - Fixed invalid assert statement in DT (MADLIB-1164)
+    - Improved feature array handling in DT (MADLIB-1173)
+    - Fixed install-check failures on non-default schema installation (MADLIB-1177, 1184)
+
+Other:
+    - Updated PyXB from 1.2.4 to 1.2.6. (MADLIB-1103)
+        This change eliminates the need to remove part of PyXB codebase as a
+        GPL-workaround.
+    - Updated the naming for gppkg (MADLIB-1183)
 
 —-------------------------------------------------------------------------
 MADlib v1.12: