treewide: add stephen-huan as maintainer

pkgs/by-name/in/inflow/package.nix

···
         '';
   };
 
-  meta = with lib; {
+  meta = {
     description = "Variance-optimal paragraph formatter";
     homepage = "https://github.com/stephen-huan/inflow";
-    license = licenses.unlicense;
+    license = lib.licenses.unlicense;
     mainProgram = "inflow";
-    maintainers = with maintainers; [ fbrs ];
-    platforms = platforms.all;
+    maintainers = with lib.maintainers; [
+      fbrs
+      stephen-huan
+    ];
+    platforms = lib.platforms.all;
   };
 }

pkgs/by-name/ip/ipaexfont/package.nix

···
     runHook postInstall
   '';
 
-  meta = with lib; {
+  meta = {
     description = "Japanese font package with Mincho and Gothic fonts";
     longDescription = ''
       IPAex font is a Japanese font developed by the Information-technology
···
       This is the successor to the IPA fonts.
     '';
     homepage = "https://moji.or.jp/ipafont/";
-    license = licenses.ipa;
-    maintainers = with maintainers; [ ];
+    license = lib.licenses.ipa;
+    maintainers = with lib.maintainers; [ stephen-huan ];
   };
 }

pkgs/by-name/of/offlineimap/package.nix

···
 
   passthru.tests.version = testers.testVersion { package = offlineimap; };
 
-  meta = with lib; {
+  meta = {
     description = "Synchronize emails between two repositories, so that you can read the same mailbox from multiple computers";
     homepage = "http://offlineimap.org";
-    license = licenses.gpl2Plus;
-    maintainers = [ ];
+    license = lib.licenses.gpl2Plus;
+    maintainers = with lib.maintainers; [ stephen-huan ];
     mainProgram = "offlineimap";
   };
 }

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

···
 
   passthru.tests.version = testers.testVersion { package = vdirsyncer; };
 
-  meta = with lib; {
+  meta = {
     description = "Synchronize calendars and contacts";
     homepage = "https://github.com/pimutils/vdirsyncer";
     changelog = "https://github.com/pimutils/vdirsyncer/blob/v${version}/CHANGELOG.rst";
-    license = licenses.bsd3;
-    maintainers = [ ];
+    license = lib.licenses.bsd3;
+    maintainers = with lib.maintainers; [ stephen-huan ];
     mainProgram = "vdirsyncer";
   };
 }