scalafmt: add agilesteel as maintainer (#551654)

pkgs/by-name/sc/scalafmt/package.nix

@@ -43,8 +43,14 @@ stdenv.mkDerivation {
     runHook postInstall
   '';
 
+  doInstallCheck = true;
+
   installCheckPhase = ''
+    runHook preInstallCheck
+
     $out/bin/${baseName} --version | grep -q "${version}"
+
+    runHook postInstallCheck
   '';
 
   passthru.updateScript = ./update.sh;
@@ -53,7 +59,10 @@ stdenv.mkDerivation {
     description = "Opinionated code formatter for Scala";
     homepage = "http://scalameta.org/scalafmt";
     license = lib.licenses.asl20;
-    maintainers = [ lib.maintainers.markus1189 ];
+    maintainers = with lib.maintainers; [
+      agilesteel
+      markus1189
+    ];
     mainProgram = "scalafmt";
   };
 }