title: how to update the vendor folder for https://github.com/hashicorp/terraform.git for terraform
body: <p>Hi i am following steps given for hashicorp/terraform and performed below activity</p>
  
  <pre><code># Get latest master branch's dependencies staged in local $GOPATH
  git checkout master
  git pull
  godep restore -v
  
  # Make your way to the dependency in question and checkout the target ref
  pushd $GOPATH/src/github.com/some/dependency
  git checkout [latest]
  
  # Head back to Terraform on a feature branch and update the dependncy to the
  # version currently in your $GOPATH
  popd
  git checkout my-feature-branch
  godep update github.com/...
  </code></pre>
  
  <p>after this i can see my Godep.json file has been updated however i dont see changes in the vendor folder . it still points to old. Well i am looking emr support from vendor for that i am updating go-aws-sdk which is available with the latest go-aws-sdk. when i called go update github.com/... it has modified the godep.json but not vendor folder .
  Could somebody please let me know the reason. Thanks</p>