failing example of received with optional param (#68)

* failing example of received with optional param

* Update Transformations.ts

Author: noelklein

spec/issues/59.test.ts

@@ -13,5 +13,6 @@ test('issue 59 - Mock function with optional parameters', (t) => {
   echoer.maybeEcho().returns('baz')
 
   t.is(echoer.maybeEcho('foo'), 'bar')
+  echoer.received().maybeEcho('foo');
   t.is(echoer.maybeEcho(), 'baz')
 })