'autotest_seleniumgrid' directory is missing

[gzgithub]

In p.109 of Practical DevOps, "There is an autotest_seleniumgrid directory, which contains a wrapper to run the test using Docker in order to start a local Selenium Grid. You can try out the example by running the wrapper" ...

But there is no autotest_seleniumgrid related script files in ch6 directory.