Update dependencies

[anthonydahanne]

• Have you made this pull request to the master branch?
  Yes

• Have you run the tests locally?
  They did not pass; apparently my ginkgo does not support the bin/test binary; I had a bunch of:

Output from proc 9:
  flag provided but not defined: -ginkgo.randomize-all
  Usage of /Users/anthonyd2/workspaces/pivotal-cf/pivnet-cli/commands/login/login.test:

I am hoping CI will function properly