0.3.21

• Fix potential data race in FlattenUnordered that introduced in 0.3.20 (#2566)

0.3.20

• Fix stacked borrows violations when -Zmiri-tag-raw-pointers is enabled. This raises MSRV of futures-task to 1.45. (#2548, #2550)
• Change FuturesUnordered to respect yielding from future (#2551)
• Add StreamExt::{flatten_unordered, flat_map_unordered} (#2083)

0.3.19

• Remove unstable read-initializer feature (#2534)
• Fix panic in FuturesUnordered (#2535)
• Fix compatibility issue with FuturesUnordered and tokio's cooperative scheduling (#2527)
• Add StreamExt::count (#2495)

0.3.18

• Fix unusable Sink implementation on stream::Scan (#2499)
• Make task::noop_waker_ref available without std feature (#2505)
• Add async LineWriter (#2477)
• Remove dependency on proc-macro-hack. This raises MSRV of utility crates to 1.45. (#2520)

0.3.17

• Use FuturesOrdered in join_all (#2412)
• Add {future, stream}::poll_immediate (#2452)
• Add stream_select! macro (#2262)
• Implement Default for OptionFuture (#2471)
• Add Peekable::{peek_mut, poll_peek_mut} (#2488)
• Add BufReader::seek_relative (#2489)

0.3.16

• Add TryStreamExt::try_chunks (#2438)
• Add StreamExt::{all, any} (#2460)
• Add stream::select_with_strategy (#2450)
• Update to new io_slice_advance interface (#2454)

0.3.15

• Use #[proc_macro] at Rust 1.45+ to fix an issue where proc macros don't work with rust-analyzer (#2407)
• Support targets that do not have atomic CAS on stable Rust (#2400)
• futures-test: Add async #[test] function attribute (#2409)
• Add stream::abortable (#2410)
• Add FuturesUnordered::clear (#2415)
• Implement IntoIterator for FuturesUnordered (#2423)
• Implement Send and Sync for FuturesUnordered iterators (#2416)
• Make FuturesUnordered::iter_pin_ref public (#2423)
• Add SelectAll::clear (#2430)
• Add SelectAll::{iter, iter_mut} (#2428)
• Implement IntoIterator for SelectAll (#2428)
• Implement Clone for WeakShared (#2396)

0.3.14

• Add future::SelectAll::into_inner (#2363)
• Allow calling UnboundedReceiver::try_next after None (#2369)
• Reexport non-Ext traits from the root of futures_util (#2377)
• Add AsyncSeekExt::stream_position (#2380)
• Add stream::Peekable::{next_if, next_if_eq} (#2379)

0.3.13

• Mitigated starvation issues in FuturesUnordered (#2333)
• Fixed race with dropping mpsc::Receiver (#2304)
• Added Shared::{strong_count, weak_count} (#2346)
• Added no_std support for task::noop_waker_ref (#2332)
• Implemented Stream::size_hint for Either (#2325)

0.3.12

• Fixed Unpin impl of future::{MaybeDone, TryMaybeDone} where trait bounds were accidentally added in 0.3.9. (#2317)