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this package seems to have new commits in its VCS but has
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commit ad302e188a89d3f2fd695a16ab0661c1ba0b0201
Author: Anthony Fok <foka@debian.org>
Date: Wed Jan 2 01:54:01 2019 -0700
Build-depend on dh-golang (>= 1.31~) for handling testdata/*
The DH_GOLANG_INSTALL_EXTRA variable for installing testdata directories
is no longer necessary and thus removed from debian/rules.