Update changelogs and script (#7278)

Author: morganchen12

Crashlytics/CHANGELOG.md

@@ -1,5 +1,5 @@
-# Unreleased
-- [changed] Removed obsolete crash reporting mechanism from the SDK
+# v7.4.0
+- [changed] Removed obsolete crash reporting mechanism from the SDK (#7076).
 
 # v7.3.0
 - [added] Added Crashlytics support for x86 apps running on Apple Silicon via Rosetta 2

FirebaseStorage/CHANGELOG.md

@@ -1,11 +1,11 @@
 # 7.4.0
-- [Fixed] Prevent second `listAll` callback. (#7197)
+- [fixed] Prevent second `listAll` callback. (#7197)
 
 # 7.3.0
-- [Fixed] Verify block is still alive before calling it in task callbacks. (#7051)
+- [fixed] Verify block is still alive before calling it in task callbacks. (#7051)
 
 # 7.1.0
-- [Fixed] Remove explicit MobileCoreServices library linkage from podspec. (#6850)
+- [fixed] Remove explicit MobileCoreServices library linkage from podspec. (#6850)
 
 # 7.0.0
 - [changed] The global variable `FIRStorageVersionString` is deleted.

scripts/make_release_notes.py

@@ -43,7 +43,7 @@
     'Firestore/CHANGELOG.md': '{{firestore}}',
     'Functions/CHANGELOG.md': '{{cloud_functions}}',
     'FirebaseRemoteConfig/CHANGELOG.md': '{{remote_config}}',
-
+    'FirebasePerformance/CHANGELOG.md': '{{perfmon}}',
     # 'GoogleDataTransport/CHANGELOG.md': '?',
 }