Long term support for Julia 1.6?

[SamuelBrand1]

Hi,

I recently put in a PR #559 which is failing CI for julia 1.6 with error

UndefVarError: Xoshiro not defined

Random.Xoshiro has been part of Julia standard libraries for a while now, and Julia 1.6 is no longer the LTS version of Julia.

So maybe its time to discontinue CI tests against 1.6?

[ztangent]

Per my comment in #559, my inclination is to keep support for 1.6 until the next breaking release (i.e. when we hit Gen 0.5.0).