Update release notes for v1.4.6

Signed-off-by: David Enyeart <enyeart@us.ibm.com>

release_notes/v1.4.6.md

@@ -1,18 +1,38 @@
-v1.4.6 Release Notes - Date TBD, 2020
-=====================================
+v1.4.6 Release Notes - February 25, 2020
+========================================
 
-What's New in Hyperledger Fabric v1.4.6
----------------------------------------
+Fixes
+-----
 
-The following enhancements are included in this release:
+- **FAB-17519: Improve Discovery endorsement policy performance**
 
-- **FAB-XXXXX: Description**
+  Fix peer CPU spikes during evaluation of endorsement policy
+  combinations, due to expensive reflection.
 
+- **Fix nil dereference in etcdraft config parsing**
 
-Fixes
------
+  The etcdraft config parsing code was failing to check that the consensus
+  metadata options are not nil.
+
+- **FAB-17523: Endorsing peer was not honoring private data RequiredPeerCount**
+
+  In Fabric v1.4.4 and v1.4.5, if there were not enough known eligible
+  peers to meet the private data collection RequiredPeerCount dissemination
+  requirement, endorsement was succeeding rather than returning an error.
+
+  **FAB-17431: Decouple javaenv version from Fabric version**
+
+  By default Fabric peer core.yaml was configured to use the following javaenv
+  image for java chaincode:
+
+  `runtime: $(DOCKER_NS)/fabric-javaenv:$(ARCH)-$(PROJECT_VERSION)`
+
+  Since javaenv versioning may deviate from Fabric versioning,
+  the javaenv reference is updated to use the latest two digit version:
+
+  `runtime: $(DOCKER_NS)/fabric-javaenv:$(TWO_DIGIT_VERSION)`
 
-- **FAB-XXXXX: Description**
+  For example, Fabric v1.4.6 would utilize fabric-javaenv:1.4.
 
 
 Changes, Known Issues, and Workarounds