essessey v0.4.0 — tracks elelem v0.4.0

No API change in this package. Adapter, Bind and the exported callbacks are
unchanged, since elelemstream only registers callbacks and never launches.

Breaking transitively: this pulls elelem v0.4.0, where Request.Complete,
Request.Stream and Request.CompleteInto no longer exist. Complete -> Run,
CompleteInto -> RunInto, Stream(ctx, fn) -> OnDelta(fn).Run(ctx).

elelem's new WithStreaming(false) is transparent here — the same callbacks
fire, so the blocks are identical and only their timing changes.