Release vibe.d 0.7.31

[Nick Sabalausky (Abscissa) via Digitalmars-d-announce]

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