maintainers: add jf-uu

maintainers/maintainer-list.nix

···
     name = "Jez Cope";
     keys = [ { fingerprint = "D9DA 3E47 E8BD 377D A317  B3D0 9E42 CE07 1C45 59D1"; } ];
   };
+  jf-uu = {
+    github = "jf-uu";
+    githubId = 181011550;
+    name = "jf-uu";
+  };
   jfchevrette = {
     email = "[e-mail]";
     github = "jfchevrette";