message: Replace -p by -r in README.md
diff: @@ -63,7 +63,7 @@ will inline the HTML Imports of `target.html` and print the result to `build.htm
  The command
  - polymer-bundler -p "path/to/target/" /target.html
  + polymer-bundler -r "path/to/target/" /target.html
  will inline the HTML Imports of `target.html`, treat `path/to/target/` as the webroot of target.html, and make all URLs absolute to the provided webroot.
  