Added should throw and should not throw assertions that operate on suspending functions

[piotrb5e3]

Description

I added support for suspend functions in should throw and should not throw, as requested in #215.
I also wrote tests for should throw and should not throw that check behavior on both suspending and regular functions.

Usage examples

coInvoking { foo() } `should throw` CustomException(12345)
coInvoking { bar() } `should not throw` CustomException::class

Checklist

• I've added my name to the AUTHORS file, if it wasn't already present.

[MarkusAmshove]

Thank you very much for the contribution :)