Added an example of how to assert on the WK spy objects received invocations without using cedar's have_received matcher.
Added an example of how to assert on the WK spy objects received invocations without using cedar's have_received matcher.

idoru/PivotalCoreKit,jfuchs/PivotalCoreKit,gudatcomputers/PivotalCoreKit,briancroom/PivotalCoreKit,jfuchs/PivotalCoreKit,mjstallard/PivotalCoreKit,pivotaltracker/PivotalCoreKit,idoru/PivotalCoreKit,gudatcomputers/PivotalCoreKit,pivotal/PivotalCoreKit