Update README.md

fixed typo

Author: mbren

README.md

@@ -2,7 +2,7 @@
 
 A barebones PHP app that makes use of the [Silex](http://silex.sensiolabs.org/) web framework, which can easily be deployed to Heroku.
 
-This application support the [Getting Started with PHP on Heroku](https://devcenter.heroku.com/articles/getting-started-with-php) article - check it out.
+This application supports the [Getting Started with PHP on Heroku](https://devcenter.heroku.com/articles/getting-started-with-php) article - check it out.
 
 ## Running Locally