Added an exclusion pattern for a "dependencies" folder in the root directory

Since the *vendor.yml* file is already excluding all kinds of dependencies, wouldn't it also make sense to also exclude a folder dedicated only for dependencies? I'm not sure how widespread a folder called *"dependencies"* is, but I'm at least using it in my own projects. There's already a pattern for a *"deps"* folder, but I don't feel that's verbose enough.

Let me know what you think. Thanks!