refactor(screenplay): Type AssertionFn renamed to Expactation, which feels more descriptive.
refactor(screenplay): Type AssertionFn renamed to Expactation, which feels more descriptive.

jan-molak/serenity-js,jan-molak/serenity-js,jan-molak/serenity-js,InvictusMB/serenity-js,InvictusMB/serenity-js,jan-molak/serenity-js,red6/serenity-js,InvictusMB/serenity-js,red6/serenity-js,red6/serenity-js,InvictusMB/serenity-js,red6/serenity-js