v0.5.0: Update go.mod

The format seems to have changed a bit in the recent vgo version.

v0.4.1: Revert "Remove non-existing target"

This reverts commit 5194816d1d4b596ab671430e60e9ee8796e45ff9.

v0.4.0

Add configuration through environment variables and use vgo to build.

v0.3.8: Merge pull request #2 from spreadshirt/fix-travis-debian-package-upload

Fix travis debian package upload