Release vibe.d 0.7.31

[Sönke Ludwig via Digitalmars-d-announce]

Am 12.04.2017 um 20:29 schrieb Nick Sabalausky (Abscissa):
> On 04/10/2017 04:48 PM, Sönke Ludwig wrote:
>> The 0.7.x branch will continue to be maintained for a short
>> while, but only bug fixes will be included from now on. Applications
>> should switch to the 0.8.x branch as soon as possible.
>>
>
> If a library depends on vibe, but wants to allow its users to use either
> 0.7.x or 0.8.x, is there a recommended way to do that?
>
> Ie: https://github.com/mysql-d/mysql-native/issues/99
>

I use ">=0.7.31 <0.9.0" in one of my projects for that purpose. Some 
kind of union operator would be nicer (e.g. "~>0.7.31 | ~>0.8.0"), but 
for all practical purposes I think it should be fine.