Added entry to maintainers.nix

Changed files
+1
lib
+1
lib/maintainers.nix
···
sjmackenzie = "Stewart Mackenzie <setori88@gmail.com>";
skeidel = "Sven Keidel <svenkeidel@gmail.com>";
smironov = "Sergey Mironov <ierton@gmail.com>";
+
spacefrogg = "Michael Raitza <spacefrogg-nixos@meterriblecrew.net>";
sprock = "Roger Mason <rmason@mun.ca>";
spwhitt = "Spencer Whitt <sw@swhitt.me>";
stephenmw = "Stephen Weinberg <stephen@q5comm.com>";