Raise lower limit of `futures` version (#89)
Raise lower limit of `futures` version (#89)

* Update the version of futures

The `sync` module of the `futures` crate was added in version `0.1.4` so we need to raise the minimum version.

* Update version of futures

Need the fix for the `Clone` bound on the type parameter on `UnboundedSender`, applied in `futures` version `0.1.6`

tempbottle/trust-dns