fix(@angular/cli): Update README.md project generation text.

[killrazor]

validate-project-name.ts looks for hypen(-) rather than the listed underscore(_).

[sumitarora]

@killrazor Please fix the commit message fix(@angular/cli): Update README.md project generation text.

[filipesilva]

Heya, thanks for fixing this. Can you change the commit message though? That's what's breaking the tests.

[killrazor]

Sorry all. I'll have to do this from home tonight as I can't figure out how edit the commit via web.

[killrazor]

It looks like trying to actually manipulate the commit is going to take more time thank just making a new one. Doing that with a corrected message instead. Sorry. Thanks.

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