[swift-evolution] [Meta] Updating the proposal template to prompt backward compatibility concerns

[Brent Royal-Gordon]

> On Jul 21, 2016, at 9:05 AM, Joe Groff via swift-evolution <swift-evolution at swift.org> wrote:
> 
> With the end of Swift 3 drawing near, we'll need to start designing with an eye toward backward compatibility. To that end, I think we should update the "Impact on existing code" proposal template to start asking writers to consider backward compatibility concerns. Here's some draft verbage to that effect:
> 
> https://github.com/jckarter/swift-evolution/blob/4bdd1b875a8402ec6bbabb3f37151262f130af2b/0000-template.md#backward-compatibility
> 
> Any concerns, revisions, or objections?

The section title should be sentence-case. Other than that, I think it's a good move.

-- 
Brent Royal-Gordon
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