ci: add more go versions for compatibility testing

[glimchb]

Signed-off-by: Boris Glimcher Boris.Glimcher@emc.com

[philippgille]

Thanks!

Actually I think we should even remove the old Go versions, as they're not supported by the Go team anymore (i.e. not even getting security fixes anymore) so shouldn't be used by anyone. And even if some do, I think for us as maintainers of an open source library it's sensible to reduce the number of supported versions to the officially supported ones.
We can still be nice and not use the latest language features or stdlib additions, so older versions should still work, but we don't provide any guarantees.

But that can follow later as well, I'm just merging this for now.

[glimchb]

Actually I think we should even remove the old Go versions, as they're not supported by the Go team anymore (i.e. not even getting security fixes anymore) so shouldn't be used by anyone. And even if some do, I think for us as maintainers of an open source library it's sensible to reduce the number of supported versions to the officially supported ones. We can still be nice and not use the latest language features or stdlib additions, so older versions should still work, but we don't provide any guarantees.

absolutely agree 100%
I left this for your discretion when exactly to retire old go versions.
we should also bump version in go.mod files...