Updated contributors section

Author: nzakas

README.md

@@ -23,4 +23,6 @@ CSSLint is a tool to help point out problems with your CSS code. It does basic s
 1. Tomasz Oponowicz, https://github.com/tomasz-oponowicz (XML format and CLI fixes)
 1. Julien Kernec'h, https://github.com/parallel (Fixed a rule)
 1. Cillian de Róiste, https://plus.google.com/116480676247600483573/posts (Node CLI fixes)
-1. Damien Sennm, https://github.com/topaxi (README fixes)
+1. Damien Sennm, https://github.com/topaxi (README fixes)
+1. Jonathan Barnett, http://twitter.com/indieisaconcept (JUnit formatter)
+1. Zach Leatherman, http://www.zachleat.com/ (bug fixes)