dtrx: add myself as maintainer

- i use the package daily, for the last 2 years or so
- i've contributed upstream
  - see: <https://github.com/dtrx-py/dtrx/pull/62>
- i've reviewed & merged r-ryantm bumps to this package
  - see: <https://github.com/NixOS/nixpkgs/pull/459951>

pkgs/by-name/dt/dtrx/package.nix

@@ -64,11 +64,11 @@ python3Packages.buildPythonApplication rec {
 
   passthru.updateScript = gitUpdater { };
 
-  meta = with lib; {
+  meta = {
     description = "Do The Right Extraction: A tool for taking the hassle out of extracting archives";
     homepage = "https://github.com/dtrx-py/dtrx";
-    license = licenses.gpl3Plus;
-    maintainers = [ ];
+    license = lib.licenses.gpl3Plus;
+    maintainers = with lib.maintainers; [ colinsane ];
     mainProgram = "dtrx";
   };
 }