Add tip for workaround to #20

Author: bradley-turek-at-domo

exercises/00-getting-started.md

@@ -70,6 +70,8 @@ Verify setup by running:
 - in Windows: double click 00-verify_setup.cmd
 - in macOS/Linux: run command `./exercises/verify/00-verify_setup.sh`
 
+> If you run into an `ImportError: cannot import name 'get_installed_distributions' from 'pip._internal.utils.misc'` error, the workaround is to downgrade your pip by running, `pip3 install pip==21.2.4`. See [issue #20](https://github.com/eficode-academy/rf-katas/issues/20) for details.
+
 This should take a few seconds. If the output of the script ends with `Setup in perfect condition!`
 we're good to go.