chore(contracts): prepare release 0.6.5

Author: robjtede

CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## Unreleased
 
+## 0.6.5
+
 - Improve support for async functions and mutable borrows in contracts.
 
 ## 0.6.4

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "contracts"
-version = "0.6.4"
+version = "0.6.5"
 description = "Design-by-contract attributes"
 authors = ["karroffel <[email protected]>"]
 edition = "2018"

Cargo.toml

@@ -5,8 +5,8 @@
 <!-- prettier-ignore-start -->
 
 [![crates.io](https://img.shields.io/crates/v/contracts?label=latest)](https://crates.io/crates/contracts)
-[![Documentation](https://docs.rs/contracts/badge.svg?version=0.6.4)](https://docs.rs/contracts/0.6.4)
-[![dependency status](https://deps.rs/crate/contracts/0.6.4/status.svg)](https://deps.rs/crate/contracts/0.6.4)
+[![Documentation](https://docs.rs/contracts/badge.svg?version=0.6.5)](https://docs.rs/contracts/0.6.5)
+[![dependency status](https://deps.rs/crate/contracts/0.6.5/status.svg)](https://deps.rs/crate/contracts/0.6.5)
 ![MIT or Apache 2.0 licensed](https://img.shields.io/crates/l/contracts.svg)
 <br />
 [![CI](https://github.com/x52dev/contracts-rs/actions/workflows/ci.yml/badge.svg)](https://github.com/x52dev/contracts-rs/actions/workflows/ci.yml)