cargo: Add myself to maintainers

pkgs/development/tools/build-managers/cargo/common.nix

···
   meta = with stdenv.lib; {
     homepage = http://crates.io;
     description = "Downloads your Rust project's dependencies and builds your project";
+    maintainers = with maintainers; [ wizeman ];
     license = [ licenses.mit licenses.asl20 ];
     platforms = platforms.linux;
   };