feat(blueprints): upgrade karma-coverage-istanbul-reporter

[mattlewis92]

I've just added threshold reporting to this lib which might be handy for some users 😄

[clydin]

The following commit message should work:
feat(@angular/cli): upgrade the blueprint karma-coverage-istanbul-reporter version

You can use git commit --amend and then force push to update the PR. (https://help.github.com/articles/changing-a-commit-message/)

[mattlewis92]

3rd times the charm 😄 #5240

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