Use vendoring for backward compatibility The switch of the Madon library to Go modules breaks builds with Go version < 1.11 since the import path now contains "v2". This patch adds vendoring so that it can still build with those versions. Let's try to re-enable Travis builds with Go v1.8-1.11...

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language: go

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go:

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    - 1.4.x

     4

    - 1.5.x

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    - 1.6.x

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    - 1.7.x

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    - 1.8.x

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    - 1.9.x

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    - "1.10.x"

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    - tip