v4.2.15

commit 08012cac7f64e58ddc47b6f0feaff3c264f63bf2
Author: Greg Althaus <galthaus@austin.rr.com>
Date:   Thu May 14 11:30:36 2020 -0500

    build: update to v4.2.15 client

M   go.mod
M   go.sum

End of Note