pythonPackages.fonttools: add myself as maintainer

Although I did not originally add this package, I've been updating it
basically exclusively in recent times and I can be pinged about it.

pkgs/development/python-modules/fonttools/default.nix

@@ -67,9 +67,10 @@ buildPythonPackage rec {
       -k 'not ttcompile_timestamp_calcs and not recalc_timestamp'
   '';
 
-  meta = {
+  meta = with lib; {
     homepage = "https://github.com/fonttools/fonttools";
     description = "A library to manipulate font files from Python";
-    license = lib.licenses.mit;
+    license = licenses.mit;
+    maintainers = [ maintainers.sternenseemann ];
   };
 }