Merge pull request #3069 from josegonzalez/patch-1

Add missing tap for homebrew installation

doc/00-intro.md

@@ -113,6 +113,7 @@ Composer is part of the homebrew-php project.
 ```sh
 brew update
 brew tap homebrew/homebrew-php
+brew tap homebrew/dupes
 brew tap homebrew/versions
 brew install php55-intl
 brew install homebrew/php/composer