maintainers: add mikecm

maintainers/maintainer-list.nix

···
     githubId = 34864484;
     name = "Mikael Fangel";
   };
+  mikecm = {
+    email = "[e-mail]";
+    github = "MaxwellDupre";
+    githubId = 14096356;
+    name = "Michael McLeod";
+  };
   mikefaille = {
     email = "[e-mail]";
     github = "mikefaille";