Add missing changelog item

Author: gaearon

CHANGELOG.md

@@ -29,6 +29,7 @@
 * Fix containing elements getting focused on SSR markup mismatch. ([@koba04](https://github.com/koba04) in [#11737](https://github.com/facebook/react/pull/11737))
 * Fix `value` and `defaultValue` to ignore Symbol values. ([@nhunzaker](https://github.com/nhunzaker) in [#11741](https://github.com/facebook/react/pull/11741))
 * Fix refs to class components not getting cleaned up when the attribute is removed. ([@bvaughn](https://github.com/bvaughn) in [#12178](https://github.com/facebook/react/pull/12178))
+* Fix an IE/Edge issue when rendering inputs into a different window. ([@M-ZubairAhmed](https://github.com/M-ZubairAhmed) in [#11870](https://github.com/facebook/react/pull/11870))
 * Throw with a meaningful message if the component runs after jsdom has been destroyed. ([@gaearon](https://github.com/gaearon) in [#11677](https://github.com/facebook/react/pull/11677))
 * Don't crash if there is a global variable called `opera` with a `null` value. [@alisherdavronov](https://github.com/alisherdavronov) in [#11854](https://github.com/facebook/react/pull/11854))
 * Don't check for old versions of Opera. ([@skiritsis](https://github.com/skiritsis) in [#11921](https://github.com/facebook/react/pull/11921))