Merge pull request #9211 from github/redsun82/swift-no-pip-install

remove `pip install` mention from README.md

Author: AlexDenisov

swift/README.md

@@ -19,12 +19,6 @@ Notice you can run `bazel run :create-extractor-pack` if you already are in the
 
 ## Code generation
 
-Make sure to install the [pip requirements](./codegen/requirements.txt) via
-
-```bash
-python3 -m pip install -r codegen/requirements.txt
-```
-
 Run
 
 ```bash