Added more contributors

* Updated my own email address.
* Added @MarkRobbo for https://github.com/common-workflow-language/cwlviewer/ -- but which email address after @student.manchester expires?
* Added @FarahZKhan for many parts in https://github.com/common-workflow-language/workflows
* Added @khillion for https://github.com/common-workflow-language/python-cwlgen/

Many more missing.. See for instance https://github.com/common-workflow-language/cwltool/graphs/contributors

Author: stain

README.md

@@ -149,16 +149,19 @@ Conduct](https://github.com/common-workflow-language/common-workflow-language/bl
 * Michael R. Crusoe <[email protected]>
 * Roman Valls Guimerà <[email protected]>
 * Guillermo Carrasco Hernandez <[email protected]>
+* Kenzo-Hugo Hillion <[email protected]>
 * Sinisa Ivkovic <[email protected]>
 * Andrey Kartashov <[email protected]>
 * John Kern <[email protected]>
+* Farah Zaib Khan <[email protected]>
 * Dan Leehr <[email protected]>
 * Hervé Ménager <[email protected]>
 * Maxim Mikheev <[email protected]>
 * Michael Miller <[email protected]>
 * Tim Pierce <[email protected]>
 * Josh Randall <[email protected]>
+* Mark Robinson <[email protected]>
 * Janko Simonović <[email protected]>
-* Stian Soiland-Reyes <soiland-reyes@cs.manchester.ac.uk>
+* Stian Soiland-Reyes <[email protected]>
 * Luka Stojanovic <[email protected]>
 * Nebojša Tijanić <[email protected]>