Update changelog

Author: github-actions[bot]

CHANGELOG.md

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+# Changelog
+
+## [Unreleased](https://github.com/Azure/terraform-azurerm-compute/tree/HEAD)
+
+**Merged pull requests:**
+
+- Adjust the "plan" input to properly set the image name and product [\#218](https://github.com/Azure/terraform-azurerm-compute/pull/218) ([AWSmith0216](https://github.com/AWSmith0216))
+- Add support for multiple virtual machine extensions. [\#217](https://github.com/Azure/terraform-azurerm-compute/pull/217) ([lonegunmanb](https://github.com/lonegunmanb))
+- Bump github.com/Azure/terraform-module-test-helper from 0.4.0 to 0.6.0 in /test [\#216](https://github.com/Azure/terraform-azurerm-compute/pull/216) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump github.com/gruntwork-io/terratest from 0.41.6 to 0.41.7 in /test [\#215](https://github.com/Azure/terraform-azurerm-compute/pull/215) ([dependabot[bot]](https://github.com/apps/dependabot))
+
+
+
+\* *This Changelog was automatically generated by [github_changelog_generator](https://github.com/github-changelog-generator/github-changelog-generator)*