KGB is hitting 5.0, and for the first time, it's getting its own

assertion methods.
These are designed to replace the usage of assertTrue, assertEqual,

etc. with checks on a spy or call. They perform the necessary checks and

then provide detailed information if the assertion goes wrong.
The following assertion methods are implemented:

assertHasSpy
assertSpyCalled
assertSpyNotCalled
assertSpyCallCount
assertSpyCalledWith
assertSpyLastCalledWith
assertSpyReturned
assertSpyLastReturned
assertSpyRaised
assertSpyLastRaised
assertSpyRaisedMessage
assertSpyLastRaisedMessage

New code should use these assertion methods for best results.
The README has been updated to show both the new-style and old-style

assertions.

Unit tests pass on all supported versions of Python.
Tested several of these through an update to an existing codebase.