Add release 1.0.1 to the changelog (#15)

This prepares for the release of version 1.0.1 with improve Openshift compatibility.

Author: douglascamata

CHANGELOG.md

@@ -4,5 +4,11 @@ All notable changes to this project will be documented in this file.
 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).
 
+## 1.0.1
+
+### Added
+
+- Better compatibility with Openshift by patching the webhook configuration json with an `add` operation instead of `replace`.
+
 ## 1.0.0
 - Initial version of the Kubernetes Webhook Certificate Manager.