• Fix minimum version of tower-layer dependency (#787)

Added

• builder,util: add convenience methods for boxing services (#616)
• all: new functions const when possible (#760)

Fixed

• util: BoxService is now Sync (#702)

Changed

• util: Removed deprecated ServiceExt::ready_and method and ReadyAnd
  future (#652)
• retry: Breaking Change retry::Policy::retry now accepts &mut Req and &mut Res instead of the previous mutable versions. This
  increases the flexibility of the retry policy. To update, update your method signature to include mut for both parameters. (#584)
• retry: Breaking Change Change Policy to accept &mut self (#681)
• retry: Add generic backoff utilities (#685)
• retry: Add Budget trait. This allows end-users to implement their own budget and bucket implementations. (#703)
• reconnect: Breaking Change Remove unused generic parameter from Reconnect::new (#755)
• ready-cache: Allow iteration over ready services (#700)
• discover: Implement Clone for Change (#701)
• util: Add a BoxCloneServiceLayer (#708)
• rng: use a simpler random 2-sampler (#716)
• filter: Derive Clone for AsyncFilterLayer (#731)
• general: Update IndexMap (#741)
• MSRV: Increase MSRV to 1.63.0 (#741)

Added

• Implement Layer for tuples of up to 16 elements (#694)

Added

• docs: Clarify subtlety around cloning and readiness in the
  Service docs (#548)
• docs: Clarify details around shared resource consumption in
  poll_ready() (#662)

Added

• load_shed: Public constructor for Overloaded error (#661)

Fixed

• util: Fix hang with call_all when the Stream of requests is pending
  (#656)
• ready_cache: Ensure cancelation is observed by pending services (#668,
  fixes #415)
• docs: Fix a missing section header due to a typo (#646)
• docs: Fix broken links to Service trait (#659)

Fixed

• hedge, load, retry: Fix use of Instant operations that can panic
  on platforms where Instant is not monotonic (#633)
• Disable attributes feature on tracing dependency (#623)
• Remove unused dependencies and dependency features with some feature
  combinations (#603, #602)
• docs: Fix a typo in the RustDoc for Buffer (#622)

Changed

• Updated minimum supported Rust version (MSRV) to 1.49.0.
• hedge: Updated hdrhistogram dependency to v7.0 (#602)
• Updated tokio-util dependency to v0.7 (#638)

Added

• util: Add BoxCloneService which is a Clone Send boxed Service (#615)
• util: Add ServiceExt::boxed and ServiceExt::boxed_clone for applying the
  BoxService and BoxCloneService middleware (#616)
• builder: Add ServiceBuilder::boxed and ServiceBuilder::boxed_clone for
  applying BoxService and BoxCloneService layers (#616)

Fixed

• util: Remove redundant F: Clone bound from ServiceExt::map_request (#607)
• util: Remove unnecessary Debug bounds from impl Debug for BoxService (#617)
• util: Remove unnecessary Debug bounds from impl Debug for UnsyncBoxService (#617)
• balance: Remove redundant Req: Clone bound from Clone impls
  for MakeBalance, and MakeBalanceLayer (#607)
• balance: Remove redundant Req: Debug bound from Debug impls
  for MakeBalance, MakeFuture, Balance, and Pool (#607)
• ready-cache: Remove redundant Req: Debug bound from Debug impl
  for ReadyCache (#607)
• steer: Remove redundant Req: Debug bound from Debug impl
  for Steer (#607)
• docs: Fix doc(cfg(...)) attributes
  of PeakEwmaDiscover, and PendingRequestsDiscover (#610)

• Fix accidental breaking change when using the
  rustdoc::broken_intra_doc_links lint (#605)
• Clarify that tower's minimum supported rust version is 1.46 (#605)

• Migrate to pin-project-lite (#595)
• builder: Implement Layer for ServiceBuilder (#600)
• builder: Add ServiceBuilder::and_then analogous to
  ServiceExt::and_then (#601)