Improve wording in changelog

Author: Karneades

CHANGELOG.md

@@ -6,7 +6,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased](https://github.com/swisscom/powergrr/compare/v0.11.0...master)
 
-This release **adds new commands for exporting (downloads) the files archive from a flow or
+This release **adds new commands for exporting (downlading) the files archive from a flow or
 a hunt**, **adds support in FileFinder flow for collecting locked files
 using raw file access** and the well known _stat_ action type and finally,
 **fixes the artifact upload mechanism required by newer GRR releases**.