Travis must do builds with modules enabled and with modules disabled.

[amherag]

We need Travis to test the installation of CX with go build -mod=vendor and without the flag, i.e. go build. We need to test that the installation works with the current vendored modules and with modules that get downloaded.

[SkycoinSynth]

Travis must do builds with modules enabled and with modules disabled.

Some users will have problems and it will work for other users.

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There is no excuse however, why golang goes to network, without first checking if dependencies are in the local vendor folder.