It got messed up by running that command offline as it adds itself to the dependencies in the Manifest file.
Now it works for pull request but not for push:
In push I get the following error now:
https://travis-ci.org/lanl-ansi/Juniper.jl/jobs/501881513#L553-L554
ERROR: failed to fetch from /home/travis/build/lanl-ansi/Juniper.jl, error: GitError(Code:ENOTFOUND, Class:Odb, object not found - no match for id (af8a6f89f7d44a0345dbb7c9d0791865958f2c4f))