README.md in pdfkit-0.4.2 vs README.md in pdfkit-0.4.3

@@ -75,9 +75,10 @@
  - add amd64 support in --install-wkhtmltopdf
 
 ## Note on Patches/Pull Requests
  
 * Fork the project.
+* Setup your development environment with: gem install bundler; bundle install
 * Make your feature addition or bug fix.
 * Add tests for it. This is important so I don't break it in a
   future version unintentionally.
 * Commit, do not mess with rakefile, version, or history.
   (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)