docs: add changelog

Author: andrzej-stencel

CHANGELOG.md

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+# Changelog
+
+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).
+
+## [Unreleased]
+
+## [v0.3.1] - 2021-07-05
+
+- Container image for kube-rbac-proxy configurable in Helm Chart (#172)
+
+## [v0.5.0] - 2021-06-14
+
+- Changes in Custom Resource for Tailing Sidecar Operator
+  - Rename TailingSidecar to TailingSidecarConfig (#142)
+  - Rename SidecarConfig to SidecarSpec in TailingSidecarConfig (#144)
+  - Rename Config to SidecarSpecs in TailingSidecarConfig  (#144)
+  - Sidecar container name defined as key in SidecarSpecs (#145)
+  - Add PodSelector to TailingSidecarConfig (#146)
+  - Add per tailing sidecar container annotations (#147)
+
+- Replace hostPath volume added to tailing sidecars with emptytDir volume (#160)
+
+- Make kube-rbac-proxy image configurable in values.yaml (#161)
+
+- Replace deprecated APIs (#152)
+  - Change apiextensions.k8s.io/v1beta1 to apiextensions.k8s.io/v1
+  - Change admissionregistration.k8s.io/v1beta1 to admissionregistration.k8s.io/v1
+  - Change cert-manager.io/v1alpha2 to cert-manager.io
+
+## [v0.4.0] - 2021-05-11
+
+- Change prefix for default tailing sidecar container name to "taling-sidecar-" (#112)
+- Change prefix for tailing sidecar volume name to "volume-sidecar-" (#114)
+- Changes in Custom Resource for Tailing Sidecar Operator
+  - Rename "file" to "path"' in CRD definition (#117)
+  - Rename "volume" to 'volumeMount' (#118)
+  - Change type for 'volumeMount' from "string" to "VolumeMount" (#119)
+- Set default tag for container images to `.Chart.AppVersion`(#111)
+- Change `reinvocationPolicy` for Mutating Webhook to `Never` from `ifNeeded` (#119)
+- Add startupProbe and livenessProbe for webhook server (#124, #125)
+- Add explicit non blocking handling of Pod deletion (#122)
+- Add tests for update of resources modified by operator (#123)
+- Add metadata for Helm Chart (#110)
+
+## [v0.3.0] - 2021-03-23
+
+- Expose mutating webhook configuration in Helm Chart #107:
+  - failurePolicy
+  - reinvocationPolicy
+  - objectSelector
+  - namespaceSelector
+
+## [v0.2.0] - 2021-03-22
+
+- Make cert-manager as an optional dependency for Helm Chart #88
+- Rename defined templates in Helm Chart #101
+- Set proper versions for Helm chart and container images #96
+- Improve documentation #93, #95, #98, #100
+
+## [v0.1.0] - 2021-03-19
+
+Initial version of tailing sidecar
+
+[v0.3.1]: https://github.com/SumoLogic/tailing-sidecar/releases/tag/v0.3.1
+[v0.5.0]: https://github.com/SumoLogic/tailing-sidecar/releases/tag/v0.5.0
+[v0.4.0]: https://github.com/SumoLogic/tailing-sidecar/releases/tag/v0.4.0
+[v0.3.0]: https://github.com/SumoLogic/tailing-sidecar/releases/tag/v0.3.0
+[v0.2.0]: https://github.com/SumoLogic/tailing-sidecar/releases/tag/v0.2.0
+[v0.1.0]: https://github.com/SumoLogic/tailing-sidecar/releases/tag/v0.1.0