Update RELEASE-NOTES.md

RELEASE-NOTES.md

@@ -4,6 +4,7 @@
 
 > **A Special Message about Flex Modals**
 > There will be an update shortly to resolve issues related to flex modals when using multiple modals and `detachable: false`, in order to not hold up this release, we've decided to move forward without a fix.
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 > A general solution will most likely require branching code for IE11 which will disable flex (as IE11 doesnt correctly implement the latest spec for [absolute positioned flex containers](https://developers.google.com/web/updates/2016/06/absolute-positioned-children)).
 
 **Critical Bugs**