Update README.MD to reflect the new karma version

[hilts-vaughan]

The package now specifies version ^3.x.x

Please make sure that your commit messages follow our convention!

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[hilts-vaughan]

I signed it!

[googlebot]

CLAs look good, thanks!

[hilts-vaughan]

Actually, looks like the peer is still not set accordingly. I've tested and at least our build works with v3. Is there a reason you don't support that one?

[Krinkle]

@hilts-vaughan Nope, was just pending CR at #264. Fixed now.