Bump to 0.5.3 and update CHANGELOG for release

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).
 
 
-## 0.5.3 - Unreleased
+## 0.5.3 - 2020-08-13
 ### Security
 - All values that become file/directory names are sanitized to address path traversal vulnerabilities (CVE-2020-15141)
 - All values that get placed into python files (everything from enum names, to endpoint descriptions, to default values) are validated and/or saniziatied to address arbitrary code execution vulnerabilities (CVE-2020-15142)

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "openapi-python-client"
-version = "0.5.2"
+version = "0.5.3"
 description = "Generate modern Python clients from OpenAPI"
 repository = "https://github.com/triaxtec/openapi-python-client"
 license = "MIT"