ng update --help doesn't list all options

[StephenFluin]

Versions

Angular CLI: 6.0.0-rc.0
Node: 9.9.0
OS: linux x64
Angular: 5.1.3
... animations, common, compiler, compiler-cli, core, forms
... http, platform-browser, platform-browser-dynamic
... platform-server, router, service-worker

@angular/cdk: 5.0.3
@angular/cli: 6.0.0-rc.0
@angular/material: 5.0.3
@angular-devkit/architect: 0.5.0
@angular-devkit/core: 0.5.0
@angular-devkit/schematics: 0.5.0
@ngtools/json-schema: 1.1.0
@schematics/angular: 0.5.0
@schematics/update: 0.5.0
typescript: 2.4.2
webpack: error

Repro steps

$ ng update --help
usage: ng update <packages> [options]
options:
  dry-run (-d)
    Run through without making any changes.
  force (-f)
    Forces overwriting of files.

Desired behavior

I would like to see the other flags that are available such as --next

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