Add contributors with >25 PRs

Author: ralfhandl

CONTRIBUTORS.md

@@ -1,9 +1,12 @@
 * Darrel Miller [@darrelmiller](https://github.com/darrelmiller)
+* Henry Andrews [@handrews](https://github.com/handrews)
 * Jason Harmon [@jharmn](https://github.com/jharmn)
 * Jeremy Whitlock [@whitlockjc](https://github.com/whitlockjc)
+* Karen Etheridge [@karenetheridge](https://github.com/karenetheridge)
 * Kris Hahn [@KrisHahn](https://github.com/krishahn)
 * Marsh Gardiner [@earth2marsh](https://github.com/earth2marsh)
 * Mike Ralphson [@MikeRalphson](https://github.com/mikeralphson)
+* Ralf Handl [@ralfhandl](https://github.com/ralfhandl)
 * Rob Dolin [@RobDolinMS](https://github.com/robdolinms)
 * Ron Ratovsky [@webron](https://github.com/webron)
 * Tony Tam [@fehguy](https://github.com/fehguy)