Fix changelogs

packages/abi-gen/CHANGELOG.json

@@ -9,6 +9,8 @@
             {
                 "note": "Remove the output directory before writing to it",
                 "pr": 822
+            }
+        ]
     },
     {
         "timestamp": 1531149657,

packages/assert/CHANGELOG.json

@@ -6,6 +6,8 @@
                 "note":
                     "Fix bug in string enum assertion. We erroneously were checking against the enum keys, not values",
                 "pr": 821
+            }
+        ]
     },
     {
         "timestamp": 1531149657,

packages/fill-scenarios/CHANGELOG.json

@@ -5,6 +5,8 @@
             {
                 "note": "Make fill-scenarios compatible with V2 of 0x protocol",
                 "pr": 656
+            }
+        ]
     },
     {
         "timestamp": 1531149657,

packages/json-schemas/CHANGELOG.json

@@ -9,6 +9,8 @@
             {
                 "note": "Added CallData schema",
                 "pr": 821
+            }
+        ]
     },
     {
         "timestamp": 1531149657,

packages/monorepo-scripts/CHANGELOG.json

@@ -5,6 +5,8 @@
             {
                 "note": "Fix git remote tag removal step & add an additional sanity assertion",
                 "pr": 803
+            }
+        ]
     },
     {
         "timestamp": 1531149657,

packages/order-utils/CHANGELOG.json

@@ -9,6 +9,8 @@
             {
                 "note": "Export parseECSignature method",
                 "pr": 684
+            }
+        ]
     },
     {
         "timestamp": 1531149657,