Singular.jl 0.5.9 released

Today Singular.jl 0.5.9 has been released.

Diff since v0.5.8

Closed issues:

• minres() does not work as expected (#114)

Merged pull requests:

• fix: fres, sres, minres, satstd requires a field for the polynomial c… (#447) (@hannes14)
• fix #114: printing resolutions (#474) (@hannes14)
• Change Array to Vector or Matrix; run CI doctests with Julia 1.6 (#475) (@fingolfin)
• Fix Array constructor (#476) (@fingolfin)
• add some missing doc strings (#479) (@tthsqe12)
• Fix @GC.preserve -> GC.@preserve (#480) (@fingolfin)
• missing gc vars (#481) (@tthsqe12)
• update version (#485) (@tthsqe12)