react.production.min.js shoud include license notice of object-assign

[dynamis]

Do you want to request a feature or report a bug?
report a bug (MIT license notice violation)

What is the current behavior?
react.development.js includes license comment about object-assign module but react.production.min.js doesn't.

https://unpkg.com/browse/react@16.12.0/umd/react.development.js (line60~)

/*
object-assign
(c) Sindre Sorhus
@license MIT
*/

https://unpkg.com/browse/react@16.12.0/umd/react.production.min.js
no comment about object-assign kept (but including the code)

What is the expected behavior?
react.production.min.js should also keep license comment about object-assign

Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?
React 16.12.0

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contribution.

[sebmarkbage]

Not sure what the rules are here but we've removed the object-assign dependency for UMD builds in #18180 so this will no longer be an issue.