Release 1.7.1

no_std support, more minimal and less intrusive version (#93)

* Support building for no_std using nightly Rust compiler

- Adds a new feature `experimental-thread-local` that enables building for no_std targets.
  If this feature is not enabled, the crate is identical as before,
  still allowing for compilation using Rust stable >= 1.38.0.

- The `experimental-thread-local` feature makes use of experimental features `thread_local`
  and `lazy_cell`, thus requiring a nightly Rust compiler.

- Support for `std::sync::RwLock` is dropped in no_std builds.

Version 1.6.0

Releasing 1.5.1

Merge pull request #66 from vorner/next

Release 1.5.0

Merge pull request #63 from vorner/const-arc-swap-option

Const ArcSwapOption initialization

Document that AsRef isn't for owned things

Conflicting trait implementations :-(

Closes #61.

Version bump to 1.3.1

Changelog

Merge pull request #50 from vorner/no-half-lock

Replace the half-lock with helping strategy