Add changelog entries from botocore

Author: aws-sdk-python-automation

.changes/next-release/api-change-cloudformation-57610.json

@@ -0,0 +1,5 @@
+{
+  "category": "``cloudformation``", 
+  "type": "api-change", 
+  "description": "[``botocore``] CloudFormation registry service now supports 3rd party public type sharing"
+}