CHANGELOG.md in google-apis-alertcenter_v1beta1-0.20.0 vs CHANGELOG.md in google-apis-alertcenter_v1beta1-0.21.0

@@ -1,6 +1,10 @@
 # Release history for google-apis-alertcenter_v1beta1
 
+### v0.21.0 (2022-06-03)
+
+* Regenerated using generator version 0.5.0
+
 ### v0.20.0 (2022-05-18)
 
 * Regenerated from discovery document revision 20220516
 
 ### v0.19.0 (2022-03-31)