[integration] Fix the release notes generation

.grenrc.js

@@ -1,5 +1,7 @@
 module.exports = {
     "prefix": "Version ",
+    "data-source": "milestones",
+    "milestone-match": "Release {{tag_name}}",
     "ignoreIssuesWith": [
         "duplicate",
         "wontfix",
@@ -10,7 +12,7 @@ module.exports = {
         "issue": "- [{{text}}]({{url}}) {{name}}"
     },
     "groupBy": {
-        "Enhancements:": ["feature", "internal", "build", "documentation", "refactor"],
+        "Enhancements:": ["feature", "internal", "build", "documentation"],
         "Bug Fixes:": ["bug"]
     }
 };