assertion failure in async bdd feature step does not fail the scenario

Add a custom assertion to an async bdd step.

eg.,
Then(..., async () => {
const data = await I.grabTextFrom(...)
ok(data === 'foo')
}

the scenario is incorrectly marked successful and also raises an UnhandledPromiseRejectionWarning

Looking deeper it seems that the typescript step definition is not being recognised as async in isAsyncFunction.

As it is not an error to await a non-promise (they are treated as resolved promises) the simple fix is #1526

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