Not showing list of subcommands when --help flag is provided

[borisding]

What you are doing?

• When running with --help provided, it's showing options list as below:

node_modules/.bin/sequelize --help

Options:
  --help     Show help                                                 [boolean]
  --version  Show version number                                       [boolean]

• same output when providing --help for subcommand, example:

node_modules/.bin/sequelize db:migrate --help

when running without --help, it's showing list of subcommands instead (which supposed showing with --help provided):

node_modules/.bin/sequelize
Sequelize CLI [Node: 8.0.0, CLI: 5.2.0, ORM: 4.41.0]

sequelize [command]

Commands:
  sequelize db:migrate                        Run pending migrations
  sequelize db:migrate:schema:timestamps:add  Update migration table to have timestamps
  sequelize db:migrate:status                 List the status of all migrations
  sequelize db:migrate:undo                   Reverts a migration
  sequelize db:migrate:undo:all               Revert all migrations ran
  sequelize db:seed                           Run specified seeder
  sequelize db:seed:undo                      Deletes data from the database
  sequelize db:seed:all                       Run every seeder
  sequelize db:seed:undo:all                  Deletes data from the database
  sequelize db:create                         Create database specified by configuration
  sequelize db:drop                           Drop database specified by configuration
  sequelize init                              Initializes project
  sequelize init:config                       Initializes configuration
  sequelize init:migrations                   Initializes migrations
  sequelize init:models                       Initializes models
  sequelize init:seeders                      Initializes seeders
  sequelize migration:generate                Generates a new migration file  [aliases: migration:create]
  sequelize model:generate                    Generates a model and its migration  [aliases: model:create]
  sequelize seed:generate                     Generates a new seed file  [aliases: seed:create]

which is different outputs in v4 (v4.1.1 for my context)

What do you expect to happen?

I wanted to see a list of subcommands when executing node_modules/.bin/sequelize --help

What is actually happening?

But it was showing options as mentioned above.

Dialect: any
Database version: N/A
Sequelize CLI version: 5.2.0
Sequelize version: 4.41.0
Platform: Windows 10, Node: v8.0.0