Fix expectation

    1) Bump with a Gemfile bundle to keep version up to date and commit
  changed Gemfile.lock
       Failure/Error: `git status`.should include "nothing to commit"
         expected "# On branch master\n# Untracked files:\n#   (use \"git
  add <file>...\" to include in what will be
  committed)\n#\n#\t.bundle/\nnothing added to commit but untracked files
  present (use \"git add\" to track)\n" to include "nothing to commit"
         Diff:
         @@ -1,2 +1,7 @@
         -nothing to commit
         +# On branch master
         +# Untracked files:
         +#   (use "git add <file>..." to include in what will be
  committed)
         +#
         +# .bundle/
         +nothing added to commit but untracked files present (use "git
  add" to track)
       # ./spec/bump_spec.rb:314:in `block (3 levels) in <top (required)>'