add mafintosh

Author: max-mapper

collaborators.md

@@ -3,5 +3,6 @@
 screencat is only possible due to the excellent work of the following collaborators:
 
 <table><tbody><tr><th align="left">maxogden</th><td><a href="https://github.com/maxogden">GitHub/maxogden</a></td></tr>
+<tr><th align="left">mafintosh</th><td><a href="https://github.com/mafintosh">GitHub/mafintosh</a></td></tr>
 <tr><th align="left">jsimplicio</th><td><a href="https://github.com/jsimplicio">GitHub/jsimplicio</a></td></tr>
 </tbody></table>