chore(contracts): prepare release 0.6.4

Author: robjtede

CHANGELOG.md

@@ -6,67 +6,69 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## Unreleased
 
+## 0.6.4
+
 - Add effective contract type to invariant violation messages.
 
-## [0.6.3] - 2022-03-13
+## 0.6.3
 
 ### Fixed
 
 - improved hygiene around `self` parameters
 - fix contract messages containing `{}` emitting warnings as they are interpreted as format strings
 
-## [0.6.2] - 2021-07-21
+## 0.6.2
 
 ### Changed
 
 - better handling of mutable borrows and lifetime relationships for functions with contracts
 
-## [0.6.1] - 2021-07-13
+## 0.6.1
 
 ### Added
 
 - support for `impl Trait` return types
 
-## [0.6.0] - 2020-09-05
+## 0.6.0
 
 ### Changed
 
 - `pre` is now `requires`
 - `post` is now `ensures`
 
-## [0.5.2] - 2020-09-05
+## 0.5.2
 
 ### Fixed
 
 - Unused braces in function body generated code are removed
 
-## [0.5.1] - 2020-08-06
+## 0.5.1
 
 ### Changed
 
 - Trait methods now handle attributes better.
 
-## [0.5.0] - 2020-08-06
+## 0.5.0
 
 ### Changed
 
 - Implication operator is now `->`.
 
-## [0.4.0] - 2020-05-01
+## 0.4.0
 
 ### Added
 
 - Added support for MIRAI assertions
 - Added implication operator
 
-## [0.3.0] - 2019-07-20
+## 0.3.0
 
 ### Added
 
 - Pseudo-function `old(expr)` which in a post-condition evaluates the expression before function execution.
 - Automatic generation of documentation containing all contracts.
 
-## [0.2.2] - 2019-07-17
+## 0.2.2
 
 ### Fixed
 
@@ -76,19 +78,19 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 - internal handling of contracts is now done in a single proc-macro pass instead of one for each contract.
 
-## [0.2.1] - 2019-06-07
+## 0.2.1
 
 ### Fixed
 
 - Functions/methods with explicit return statements no longer skip `post` conditions
 
-## [0.2.0] - 2014-04-12
+## 0.2.0
 
 ### Added
 
 - `contract_trait` attribute to make all implementors of a trait respect contracts.
 
-## [0.1.1] - 2019-04-08
+## 0.1.1
 
 ### Added
 
@@ -97,7 +99,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
   - `override_debug` only checks contracts in debug configurations.
   - `override_log` only prints using the `log`-crate interface.
 
-## [0.1.0] - 2019-04-06
+## 0.1.0
 
 ### Added
 

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "contracts"
-version = "0.6.3"
+version = "0.6.4"
 description = "Design-by-contract attributes"
 authors = ["karroffel <[email protected]>"]
 edition = "2018"