Switch ReleaseNotes from .rst to .md to match the other docs.
At the same time, fix the version number for master.
Does this line need an edit for llvm 12?
Thanks for revisiting this.
I don't think so. Flang is new for the LLVM 11 release and will not be for the LLVM 12 release. I'm just applying the changes to master first before backporting to the release branch.
I suspect that we will end up re-writing this whole text block for LLVM 12 when the time comes depending on the status of Flang at that time.
Looks like I committed this without the link text as 69230e7