Bump base version

[David Feuer]

On Sunday, August 26, 2018 9:54:09 AM EDT Ryan Scott wrote:
> I'm confused. base-4.12.0.0 hasn't been released yet, so can't we just make
> this StableName change a part of 4.12.0.0?
> 
> (Regardless of what we choose, we should make sure to advertise this change
> in base's changelog—currently it's unmentioned.)
> 
> Ryan S.

I don't know what the policy is, to be honest! Is an alpha version a "real" version,
whose base library has its own version number? Or is it a version that is expected
to disappear as soon as the beta or full release comes out?

-- 
David Feuer
Well-Typed