golang-github-openvex-go-vex release 0.2.7-2 for unstable

[dgit distro=debian split --quilt=unapplied]
[dgit please-upload source=golang-github-openvex-go-vex version=0.2.7-2 upstream-tag=v0.2.7 upstream=3185a64ed27703fc3fe4af8cd5e1ce0ed2fa2569]