Best of both worlds!
(Because you can't override the default rubocop includes)
The binstub basically, lets me safely `rubocop test/foo_test.rb`
instead of `bundle exec rubocop test/foo_test.rb`
```bash
# ~/.profile
# https://twitter.com/tpope/status/165631968996900865
# tl;dr `mkdir .git/safe` to add `bin` to path, e.g. `bin/rails`
PATH=".git/safe/../../bin:$PATH"
```
