gridiron 0.6.0

Rust finite field library with fixed size multi-word values.
Documentation
# Changelog

## 0.6.0

- [[#21]#21] - Many fixes for edge cases, remove Barrett. Breaking changes on macro invocation.
- [[#20]#20] - Fix defect in const_eq0 and related div_mod issue.
- [[#19]#19] - Make abs constant time.

## 0.5.2

- [[#18]#18] - Add From<[u8; 64]> to Fp480

## 0.5.1

- [[#17]#17] - Clippy cleanup
- [[#16]#16] - Add inverse and div to Monty

## 0.5.0

- [[#13]#13] - Add const_swap_if to support swapping fp values in constant time.
- [[#14]#14] - Standardize on non secret u32 values for mul and pow.

## 0.4.0

- [[#10]#10] - Visibility and Documentation Changes
- [[#11]#11] - Rust 2018 support