Aptly script has now become aptly task

It makes more sense. Multiple lines of aptly commands can now be called
'aptly tasks' which could potentially be automated, in the future?

cmd/cmd.go

@@ -57,9 +57,9 @@ package environment to new version.`,
 			makeCmdGraph(),
 			makeCmdMirror(),
 			makeCmdRepo(),
-			makeCmdScript(),
 			makeCmdServe(),
 			makeCmdSnapshot(),
+			makeCmdTask(),
 			makeCmdPublish(),
 			makeCmdVersion(),
 		},