Update futures requirement from 0.1 to 0.3
Update futures requirement from 0.1 to 0.3

Updates the requirements on [futures](https://github.com/rust-lang/futures-rs) to permit the latest version.
- [Release notes](https://github.com/rust-lang/futures-rs/releases)
- [Changelog](https://github.com/rust-lang/futures-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/futures-rs/compare/futures-cpupool-0.1.1...0.3.14)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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