message: Update CHANGELOG.md
  Minor formatting improvement.
diff: ## 1.0.6 - 19 Jul 2021
  -- The `init` step of the Action now supports a `source-root` input as a path to the root source-code directory. By default, the path is relative to $GITHUB_WORKSPACE. [#607](https://github.com/github/codeql-action/pull/607)
  +- The `init` step of the Action now supports a `source-root` input as a path to the root source-code directory. By default, the path is relative to `$GITHUB_WORKSPACE`. [#607](https://github.com/github/codeql-action/pull/607)
  - The `init` step will now try to install a few Python tools needed by this Action when running on a self-hosted runner. [#616](https://github.com/github/codeql-action/pull/616)
  ## 1.0.5 - 12 Jul 2021
  