`--copy-from` not removed from help

[dtopuzov]

tns create --help output:

### Options

    * --path - Specifies the directory where you want to create the project, if different from the current directory. The directory must be empty.
    * --appid - Sets the application identifier for your project.
    * --copy-from - Specifies a directory which contains an existing NativeScript project. If --copy-from and --template are not set, the NativeScript CLI creates the project from the default JavaScript hello-world template.
    * --template - Specifies a valid npm package which you want to use to create your project. If --copy-from and --template are not set, the NativeScript CLI creates the project from the default JavaScript hello-world template.
    * --ng - Sets the template for your project to the Angular template.
    * --tsc - Sets the template for your project to the TypeScript template.

tns version: 3.0.0-2017.2.9.3