Angular: Fix detection of @angular/cli package version

[juristr]

Issue:

Right now in 6.4.0 rc.2 there is an issue with the detection of the @angular/cli package version. The current setup reads the package.json for the presence of the @angular/cli. That doesn't work in the case of a publishable Angular library, which has it's own package.json but does not contain a reference to the @angular/cli package (like an Angular application).

This PR fixes it, by resolving the @angular/cli package and by reading its exported VERSION constant.

What I did

How to test

• Is this testable with Jest or Chromatic screenshots?
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

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[shilman]

Looking good 💯 Thanks @juristr !!!

[ThibaudAV]

LGTM 🚀 Thanks