rustc-hash 2.0.0

A speedy, non-cryptographic hashing algorithm used by rustc
Documentation 
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## 2.0.0

- Replace hash with faster and better finalized hash.
  This replaces the previous "fxhash" algorithm originating in Firefox
  with a custom hasher designed and implemented by Orson Peters ([`@orlp`](https://github.com/orlp)).
  It was measured to have slightly better performance for rustc, has better theoretical properties
  and also includes a signficantly better string hasher.
- Fix `no_std` builds

## 1.2.0 (**YANKED**)

**Note: This version has been yanked due to issues with the `no_std` feature!**

- Add a `FxBuildHasher` unit struct
- Improve documentation
- Add seed API for supplying custom seeds other than 0
- Add `FxRandomState` based on `rand` (behind the `rand` feature) for random seeds
- Make many functions `const fn`
- Implement `Clone` for `FxHasher` struct