OS Icon Updates + Added Info to AUTHORS.md (#4058)

* Updated OS Icons

Cleaned up image for Lenovo - new images for asuswrt-merlin, swos,
tomato. Minor update for MikroTik RB260GS.

* Added Contact Information to AUTHORS.md

* Update Lenovo Icon (32x32), Revert SwOS Change

* Added Text per Contributor Agreement

I agree to the conditions of the Contributor Agreement
contained in doc/General/Contributing.md.

AUTHORS.md

@@ -119,6 +119,7 @@ LibreNMS contributors:
 - Vladislav Solovei <vladsol2009@gmail.com> (vladsol)
 - Daniel van Dorp <daniel@vandorp.biz> (djvdorp)
 - Phil Regnauld <regnauld@x0.dk> (reegnauld)
+- Russell Morris <github@rkmorris.us> (arrmo)
 - Bennett Blodinger <bennett.blodinger@gmail.com> (benwa)
 
 [1]: http://observium.org/ "Observium web site"