Update help command in README.md

[miltador]

Help command is incorrect with the current version of angular-cli.

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[miltador]

I signed it!

[googlebot]

CLAs look good, thanks!

[grizzm0]

Dupe of #3159
Can be closed.

[miltador]

#3159 doesn't fix README.md template.

[grizzm0]

It has already been pointed out in the comments

[filipesilva]

Dupe of #3159 as @grizzm0 pointed out. I'll be merging that one soon.

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