Merge pull request #1411 from finwe/readme-contributors-pronoun

Correct pronoun in readme for contributors

README.md

@@ -93,7 +93,7 @@ Bugs and feature request are tracked on [GitHub](https://github.com/Seldaek/mono
 ### Author
 
 Jordi Boggiano - <j.boggiano@seld.be> - <http://twitter.com/seldaek><br />
-See also the list of [contributors](https://github.com/Seldaek/monolog/contributors) which participated in this project.
+See also the list of [contributors](https://github.com/Seldaek/monolog/contributors) who participated in this project.
 
 ### License