maintainers: add email for willfish

Author: willfish

maintainers/maintainer-list.nix

@@ -28298,6 +28298,7 @@
     name = "Will Cohen";
   };
   willfish = {
+    email = "willfish@pescado.mozmail.com";
     github = "willfish";
     githubId = 8156884;
     name = "William Fish";