Singular.jl 0.19.0 released

Today Singular.jl 0.19.0 has been released.

Diff since v0.18.18

Merged pull requests:

• handling singular error from libraries (#721) (@hannes14)
• update Singular_jll and libsingular_julia_jll (#723) (@hannes14)
• Move a bunch of examples into docstring (#724) (@fingolfin)
• Add intersection for smodule (#725) (@fingolfin)
• Use setdocmeta to simplify writing docstring examples (#726) (@fingolfin)
• Switch to Documenter 1.x (#727) (@fingolfin)
• Remove dead code (#728) (@fingolfin)
• Add some finite ring/field coercion (#729) (@fingolfin)