spin 0.6.0

Spin-based synchronisation primitives
Documentation
# Changelog

All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

# [0.6.0] - 2020-10-08

### Added

- More dynamic `Send`/`Sync` bounds for lock guards
- `lock_api` compatibility
- `Guard::leak` methods
- `RwLock::reader_count` and `RwLock::writer_count`
- `Display` implementation for guard types

### Changed

- Made `Debug` impls of lock guards just show the inner type like `std`