README.md in u3d-1.0.10 vs README.md in u3d-1.0.11

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 * pass the password using `U3D_PASSWORD` environment variable
 
 * if on Mac, use the keychain option (you set it before hand on the machine, e.g. from the command line using `u3d credentials` add (use `u3d credentials check` to verify) and then use `u3d install -k` to activate the keychain while installing.
 
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+For more information see also [how to use u3d to install Unity on a CI server](docs/ci_setup.md).
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 ### Install ruby
 
  * __On MacOS and Linux:__
 
 Your usual package manager should be available to install it easily for you. On UNIX systems, we recommend you use [RVM (Ruby Version Manager)](https://rvm.io/rvm/install), which lets you manage several versions of Ruby.