v2.4.0

• Add a "fuse" method that makes it so a Future returns Poll::Pending
  forever after it returns Poll::Pending once. (#101)
• Add a "stop_after_future" function that allows for running a Stream until a
  Future completes. (#103)
• Make it so Zip/TryZip drop completed futures. (#106)

v2.3.0

• Add StreamExt::drain for draining objects from a Stream without waiting (#70).

v2.2.0

• Relax Unpin bounds on io::copy. (#87)
• Implement size_hint for stream::Filter. (#88)
• Relax MSRV to 1.60. (#90)

v2.1.0

• Make it so read_line and other futures use a naive implementation of byte
  searching unless the memchr feature is enabled. This prevents needing to
  compile the memchr crate unless it is desired. (#77)

v2.0.1

• Remove dependency on the waker-fn crate. (#81)

v2.0.0

• Breaking: Expose future::{ready, pending} from core instead of defining
  our own. (#73)
• Breaking: The TryZip and Zip combinators are modified to have a cleaner
  API, where generic constraints are not necessary on the structure itself at the
  cost of additional generics. (#74)
• Add a way to use racey futures on no_std by providing your own seed. (#75)

v1.13.0

• Unbind Debug implementations of BufReader and BufWriter. (#49)
• Add the once_future() combinator. (#59)
• Add a combinator for temporarily using an AsyncRead/AsyncWrite as Read/Write. (#62)
• Implement more methods for stream::BlockOn. (#68)