golang-github-thediveo-enumflag release 2.1.0-1 for unstable

[dgit distro=debian split --quilt=gbp]
[dgit please-upload source=golang-github-thediveo-enumflag version=2.1.0-1 upstream-tag=v2.1.0 upstream=6cd72dd082d2640417f27c02a687c799a30a331a]