docs: add changelog

Author: andrzej-stencel

.gitignore

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+.vscode/*
+!.vscode/snippets.code-snippets

.vscode/snippets.code-snippets

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+// https://code.visualstudio.com/docs/editor/userdefinedsnippets
+{
+	"Link to pull request": {
+		"scope": "markdown",
+		"prefix": ["PR"],
+		"body": ["[#${1:123}]: https://github.com/SumoLogic/sumologic-kubernetes-setup/pull/${1}"],
+		"description": "Link to GitHub pull request",
+	}
+}

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
+
+- chore: bump terraform to 1.1.4 [#25]
+- chore: update collection to 2.4.1 [#27]
+
+[#25]: https://github.com/SumoLogic/sumologic-kubernetes-setup/pull/25
+[#27]: https://github.com/SumoLogic/sumologic-kubernetes-setup/pull/27
+
+## [v3.2.0] - 2022-01-11
+
+- chore: update dependencies to latest stable [#24]
+  - Terraform to `1.1.3`
+  - Alpine base image to `3.15`
+
+[v3.2.0]: https://github.com/SumoLogic/sumologic-kubernetes-setup/releases/v3.2.0
+[#24]: https://github.com/SumoLogic/sumologic-kubernetes-setup/pull/24
+
+## [v3.1.1] - 2021-04-29
+
+- Bump terraform to 0.13.7 [#6]
+
+[v3.1.1]: https://github.com/SumoLogic/sumologic-kubernetes-setup/releases/v3.1.1
+[#6]: https://github.com/SumoLogic/sumologic-kubernetes-setup/pull/6
+
+## [v3.1.0] - 2021-04-29
+
+- feat: Build images for ARM [#4]
+
+[v3.1.0]: https://github.com/SumoLogic/sumologic-kubernetes-setup/releases/v3.1.0
+[#4]: https://github.com/SumoLogic/sumologic-kubernetes-setup/pull/4
+
+## [v3.0.0] - 2021-03-05
+
+- Bump base image to `alpine:3.13`
+- Bump terraform to `0.13`
+
+[v3.0.0]: https://github.com/SumoLogic/sumologic-kubernetes-setup/releases/v3.0.0