Add changelog entries

packages/order-watcher/CHANGELOG.json

@@ -9,6 +9,13 @@
             {
                 "note": "Do not stop subscription if error is encountered",
                 "pr": 825
+            },
+            {
+                "note":
+                    "Add blockRetention config to OrderWatcher, so user can define how many blocks and they corresp. logs to store in-memory"
+            },
+            {
+                "note": "Fixed a bug that caused the incorrect block to be fetched via JSON-RPC within Blockstream"
             }
         ],
         "timestamp": 1531149657