Set changelog release date for 0.5.0

Author: dbanty

CHANGELOG.md

@@ -5,7 +5,7 @@ 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).
 
 
-## 0.5.0 - Unreleased
+## 0.5.0 - 2020-08-05
 ### Changes
 - When encountering a problem, the generator will now differentiate between warnings (things it was able to skip past)
     and errors (things which halt generation altogether).

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "openapi-python-client"
-version = "0.4.2"
+version = "0.5.0"
 description = "Generate modern Python clients from OpenAPI"
 repository = "https://github.com/triaxtec/openapi-python-client"
 license = "MIT"