printUsage method
Prints the usage information for this command.
This is called internally by run and can be overridden by subclasses to control how output is displayed or integrate with a logging system.
Implementation
@override
void printUsage() => console.info(
'$description\n\nUsage: $invocation\n\n'
'dpk passes every argument to "dart pub $name". Run "dpk $name --help" '
'to see its options.',
);