Replace promise.inspect()
Replace promise.inspect()

Bluebird promises don't have an `inspect()` method, but do have an
`isFulfilled()` and a `value()` method, so use them instead.

matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk,krombel/matrix-js-sdk,matrix-org/matrix-js-sdk,krombel/matrix-js-sdk,matrix-org/matrix-js-sdk,krombel/matrix-js-sdk