fix: update error message text for generate migration command when mi…

…ssing name argument

enforce the type of the name argument in order to return a more useful error message when the user forgets to provide a migration name to the generate migration command

Closes: typeorm#2719, typeorm#4798, typeorm#4805

src/commands/MigrationGenerateCommand.ts

@@ -105,7 +105,7 @@ export class MigrationGenerateCommand implements yargs.CommandModule {
 
                     console.log(chalk.green(`Migration ${chalk.blue(path)} has been generated successfully.`));
                 } else {
-                    console.log(chalk.yellow("Please specify migration name"));
+                    console.log(chalk.yellow("Please specify a migration name using the `-n` argument"));
                 }
             } else {
                 console.log(chalk.yellow(`No changes in database schema were found - cannot generate a migration. To create a new empty migration use "typeorm migration:create" command`));