[swift-evolution] [Administrative] Update proposals with Accepted/Rejected status

[Chris Lattner]

> On Feb 29, 2016, at 12:54 PM, Kenny Leung via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Hi All.
> 
> I’ve noticed that when proposals are accepted or rejected, there is nothing inside the proposal that indicates it.
> 
> Also, it would be nice if the blurb in the announcement email (like this one: http://article.gmane.org/gmane.comp.lang.swift.evolution/7735) was put into the proposal to provide further clarification and prevent future rehashing of a subject.

It would be great to improve this, please send in PRs!  :-)

-Chris