Chai 4.0

[nkovacs]

Could you please add support for chai 4.0? Sinon-chai already supports it.

I did a quick test with https://github.com/vuejs-templates/webpack, and it worked fine.

[KaiSchwarz-cnic]

+1 as 4.1 is already available...

[kashiif]

PR #48 fixes this.

[bankyadam]

Published as karma-sinon-chai@1.3.2