Merge pull request airbnb#26 from felipevolpatto/patch-1

Add Portuguese translation link

Author: ljharb

README.md

@@ -296,3 +296,4 @@ If you must use an ID selector in the first place (and you should really try not
   - ![ru](https://raw.githubusercontent.com/gosquared/flags/master/flags/flags/shiny/24/Russia.png) **Russian**: [Nekorsis/css-style-guide](https://github.com/Nekorsis/css-style-guide)
   - ![ja](https://raw.githubusercontent.com/gosquared/flags/master/flags/flags/shiny/24/Japan.png) **Japanese**: [nao215/css-style-guide](https://github.com/nao215/css-style-guide)
   - ![es](https://raw.githubusercontent.com/gosquared/flags/master/flags/flags/shiny/24/Spain.png) **Spanish**: [ismamz/guia-de-estilo-css](https://github.com/ismamz/guia-de-estilo-css)
+  - ![PT-BR](https://raw.githubusercontent.com/gosquared/flags/master/flags/flags/shiny/24/Brazil.png) **Portuguese**: [felipevolpatto/css-style-guide](https://github.com/felipevolpatto/css-style-guide)