Update futures requirement from =0.1.29 to =0.3.1

Updates the requirements on futures to permit the latest version.

Release notes

*Sourced from [futures's releases](https://github.com/rust-lang-nursery/futures-rs/releases).* > ## 0.3.1 > * Fix signature of `LocalSpawn` trait (breaking change -- see [#1959](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1959))

Changelog

*Sourced from [futures's changelog](https://github.com/rust-lang-nursery/futures-rs/blob/master/CHANGELOG.md).* > # 0.3.1 - 2019-11-7 > * Fix signature of `LocalSpawn` trait (breaking change -- see [#1959](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1959)) > > # 0.3.0 - 2019-11-5 > * Stable release along with stable async/await! > * Added async/await to default features ([#1953](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1953)) > * Changed `Spawn` trait and `FuturesUnordered::push` to take `&self` ([#1950](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1950)) > * Moved `Spawn` and `FutureObj` out of `futures-core` and into `futures-task ([#1925](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1925)) > * Changed case convention for feature names ([#1937](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1937)) > * Added `executor` feature ([#1949](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1949)) > * Moved `copy_into`/`copy_buf_into` ([#1948](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1948)) > * Changed `SinkExt::send_all` to accept a `TryStream` ([#1946](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1946)) > * Removed `ThreadPool::run` ([#1944](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1944)) > * Changed to use our own definition of `io::Cursor` ([#1943](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1943)) > * Removed `BufReader::poll_seek_relative` ([#1938](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1938)) > * Changed `skip` to take a `usize` rather than `u64` ([#1931](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1931)) > * Removed `Stream` impl for `VecDeque` ([#1930](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1930)) > * Renamed `Peekable::peek` to `poll_peek` ([#1928](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1928)) > * Added immutable iterators for `FuturesUnordered` ([#1922](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1922)) > * Made `ThreadPool` optional ([#1910](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1910)) > * Renamed `oneshot::Sender::poll_cancel` to `poll_canceled` ([#1908](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1908)) > * Added some missing `Clone` implementations > * Documentation fixes > > # 0.3.0-alpha.19 - 2019-9-25 > * Stabilized the `async-await` feature ([#1816](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1816)) > * Made `async-await` feature no longer require `std` feature ([#1815](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1815)) > * Updated `proc-macro2`, `syn`, and `quote` to 1.0 ([#1798](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1798)) > * Exposed unstable `BiLock` ([#1827](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1827)) > * Renamed "nightly" feature to "unstable" ([#1823](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1823)) > * Moved to our own `io::{Empty, Repeat, Sink}` ([#1829](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1829)) > * Made `AsyncRead::initializer` API unstable ([#1845](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1845)) > * Moved the `Never` type from `futures-core` to `futures-util` ([#1836](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1836)) > * Fixed use-after-free on panic in `ArcWake::wake_by_ref` ([#1797](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1797)) > * Added `AsyncReadExt::chain` ([#1810](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1810)) > * Added `Stream::size_hint` ([#1853](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1853)) > * Added some missing `FusedFuture` ([#1868](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1868)) and `FusedStream` implementations ([#1831](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1831)) > * Added a `From` impl for `Mutex` ([#1839](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1839)) > * Added `Mutex::{get_mut, into_inner}` ([#1839](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1839)) > * Re-exported `TryConcat` and `TryFilter` ([#1814](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1814)) > * Lifted `Unpin` bound and implemented `AsyncBufRead` for `io::Take` ([#1821](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1821)) > * Lifted `Unpin` bounds on `get_pin_mut` ([#1820](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1820)) > * Changed `SendAll` to flush the `Sink` when the source `Stream` is pending ([#1877](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1877)) > * Set default threadpool size to one if `num_cpus::get()` returns zero ([#1835](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1835)) > * Removed dependency on `rand` by using our own PRNG ([#1837](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1837)) > * Removed `futures-core` dependency from `futures-sink` ([#1832](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1832)) > > # 0.3.0-alpha.18 - 2019-8-9 > * Rewrote `join!` and `try_join!` as procedural macros to allow passing expressions ([#1783](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1783)) > * Banned manual implementation of `TryFuture` and `TryStream` for forward compatibility. See [#1776](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1776) for more details. ([#1777](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1777)) > ... (truncated)

Commits

- [`16afd7c`](https://github.com/rust-lang-nursery/futures-rs/commit/16afd7cdc1c85d7de669b5a2c2055586572928cb) Stage 0.3.1 - [`fc5f44c`](https://github.com/rust-lang-nursery/futures-rs/commit/fc5f44c231906ea376195736b75fa77601a6a984) fix: [Local]SpawnExt should take &self as their base traits - [`438e53a`](https://github.com/rust-lang-nursery/futures-rs/commit/438e53a7c54338067baab6c462866501918993d7) Merge pull request [#1963](https://github-redirect.dependabot.com/rust-lang-nursery/futures-rs/issues/1963) from taiki-e/ci - [`5a3605e`](https://github.com/rust-lang-nursery/futures-rs/commit/5a3605e4199313615bea3ffb37899e515f541e55) Temporarily ignore buffer_unordered::works test on all targets - [`3e91014`](https://github.com/rust-lang-nursery/futures-rs/commit/3e91014f6f2f4197f434ffac57b7597252dbf665) Update and fix CI config - [`0c7fa20`](https://github.com/rust-lang-nursery/futures-rs/commit/0c7fa20ae07b59af4c04487817f33a830561b7e9) Stage 0.3.0 release - [`133f9ce`](https://github.com/rust-lang-nursery/futures-rs/commit/133f9ce555e6bbda8c171018c65dcaa76f5cc27f) Change stream bounds of send_all - [`4fef913`](https://github.com/rust-lang-nursery/futures-rs/commit/4fef913048cc083f824a5cc4d22d2beb435bb936) Add async/await to default features - [`47f3ccb`](https://github.com/rust-lang-nursery/futures-rs/commit/47f3ccb0f7243a02a2258d5cf0942e892f3ac858) Make `Spawn::spawn` take `&self` rather than `&mut self` - [`07518c5`](https://github.com/rust-lang-nursery/futures-rs/commit/07518c5088e437b54d46f1b9b03881c63b64fa11) Revert "Move AtomicWaker from futures-core to futures-task" - Additional commits viewable in [compare view](https://github.com/rust-lang-nursery/futures-rs/compare/0.1.29...0.3.1)

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nlopes / libhoney-rust

Update futures requirement from =0.1.29 to =0.3.1 #20