chore: prepare release 0.13.0

Author: dbanty

Diff for: CHANGELOG.md

@@ -13,6 +13,17 @@ Programmatic usage of this project (e.g., importing it as a Python module) and t
 
 The 0.x prefix used in versions for this project is to indicate that breaking changes are expected frequently (several times a year). Breaking changes will increment the minor number, all other changes will increment the patch number. You can track the progress toward 1.0 [here](https://github.com/openapi-generators/openapi-python-client/projects/2).
 
+## 0.13.0
+
+### Breaking Changes
+
+- run `post_hooks` in package directory instead of current directory if meta=none [#696, #697]. Thanks @brenmous and @wallagib!
+- Treat leading underscore as a sign of invalid identifier [#703]. Thanks @maxkomarychev!
+
+### Fixes
+
+- generated docstring for `Client.get_headers` function [#713]. Thanks @rtaycher!
+
 ## 0.12.3
 
 ### Features

Diff for: pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "openapi-python-client"
-version = "0.12.3"
+version = "0.13.0"
 description = "Generate modern Python clients from OpenAPI"
 repository = "https://github.com/triaxtec/openapi-python-client"
 license = "MIT"