update .travis.yml

1 job for test_authority in 45 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #2729
test-authority

00:00:45

 
Name Stage Failure
failed
test-authority Test
 * [new branch]      test_authority -> origin/test_authority
* [new branch] test_gitlab_ci -> origin/test_gitlab_ci
Checking out 2e8f4023 as test_authority...

Skipping Git submodules setup
$ mkdir -p /go/src/github.com
$ cp -r /builds/katzenpost/* /go/src/github.com/katzenpost/
cp: target '/go/src/github.com/katzenpost/' is not a directory
ERROR: Job failed: exit code 1