README.md in quality-31.0.0 vs README.md in quality-31.1.0

@@ -52,10 +52,10 @@
 jumbo-latest, jumbo-x.y.z, etc)
 
 ## How to use - as part of a Ruby-based Rakefile
 
 ```bash
-pip install pycodestyle flake8
+pip install 'pycodestyle<2.4.0' flake8
 brew install cmake icu4c shellcheck scalastyle # OS X
 gem install quality
 ```
 
 or in your Gemfile: