dependencies:

  library_name:

   git: https://github.com/username/library_name

dependencies:

  library_name:

   git:

    url: https://github.com/username/library_name.git

    ref: dev    #branch name

dependencies:

  library_name:

   git:

    url: https://github.com/username/library_name.git

    ref: e234072340    #commit reference id

dependencies:

  library_name:

   path: /path/to/library_name