futures breaking changes

• 0.3.30 \u2192 0.3.31breaking

  Fix use after free of task in `FuturesUnordered` when dropped future panics (#2886)

• 0.3.30 \u2192 0.3.31breaking

  Fix soundness bug in `task::waker_ref` (#2830)

• 0.3.30 \u2192 0.3.31breaking

  Fix bugs in `AsyncBufRead::read_line` and `AsyncBufReadExt::lines` (#2884)

• 0.3.30 \u2192 0.3.31breaking

  Fix parsing issue in `select!`/`select_biased!` (#2832)

• 0.3.30 \u2192 0.3.31breaking

  Work around issue due to upstream `Waker::will_wake` change (#2865)

• 0.3.30 \u2192 0.3.31breaking

  Add `stream::Iter::{get_ref,get_mut,into_inner}` (#2875)

• 0.3.30 \u2192 0.3.31breaking

  Add `future::AlwaysReady` (#2825)

• 0.3.30 \u2192 0.3.31breaking

  Relax trait bound on non-constructor methods of `io::{BufReader,BufWriter}` (#2848)

• 0.3.9 \u2192 0.3.10breaking

  Fixed type-inference in `sink::unfold` by specifying more of its types (breaking change -- see #2311)

• 0.3.0 \u2192 0.3.1api

  Fix signature of `SpawnExt` and `LocalSpawnExt` trait (breaking change -- see #1959)

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