[OE-core] Add recipes for Go v1.13

[Richard Purdie]

On Thu, 2019-10-24 at 21:59 +0430, Alexander Kube wrote:
> This patch set adds various go-1.13 recipes and changes the
> poky GOVERSION to 1.13%. It leaves the existing go-1.12
> recipes untouched and available for existing users of
> those recipes.

Thanks for these patches. How compatible is 1.13 with 1.12 and do we
still need the 1.12 recipes? I'm wondering how hard it will be for
people to migrate...

Cheers,

Richard