documentation info angular cli v6 support nodejs 8.9.x+

[djleonskennedy]

Versions

6.0.0

### Repro steps
N/A


### Observed behavior
N/A

### Desired behavior
N/A


### Mention any other details that might be useful (optional)
Please add minimum nodejs version in repo description

[tiaguinho]

@mgechev I think this is already in the readme of the repository. https://github.com/angular/angular-cli#installation
There is any other place to add the information?

[mgechev]

@tiaguinho thanks for pointing this out. I think this is enough.

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