Update CHANGES.txt for 1.3.5RC0
diff --git a/CHANGES.txt b/CHANGES.txt
index 6c5bb84..13e57db 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -11,6 +11,7 @@
 ** Bug
     * [HBASE-17170] - HBase is also retrying DoNotRetryIOException because of class loader differences.
     * [HBASE-20851] - Change rubocop config for max line length of 100
+    * [HBASE-21920] - Ignoring 'empty' end_key while calculating end_key for new region in HBCK -fixHdfsOverlaps command can cause data loss
     * [HBASE-22235] - OperationStatus.{SUCCESS|FAILURE|NOT_RUN} are not visible to 3rd party coprocessors
     * [HBASE-22270] - master's jmx.clusterRequests could be negative in branch-1
     * [HBASE-22391] - Fix flaky tests from TestFromClientSide
@@ -20,6 +21,7 @@
     * [HBASE-22508] - Address findbugs/spotbugs complaints (branch-1.3) 
     * [HBASE-22518] - yetus personality is treating branch-1.4 like earlier branches for hadoopcheck
     * [HBASE-22533] - TestAccessController3 is flaky (branch-1)
+    * [HBASE-22540] - [Memstore] Correct counters in MemStoreChunkPool
 
 ** New Feature
     * [HBASE-21815] - Make isTrackingMetrics and getMetrics of ScannerContext public