Add date

Author: lildude

README.md

@@ -3,7 +3,7 @@
 This repository includes backup and recovery utilities for [GitHub Enterprise][1].
 
 **Note**: the [GitHub Enterprise version requirements](docs/requirements.md#github-enterprise-version-requirements) have
-changed starting with Backup Utilities v2.13.0.
+changed starting with Backup Utilities v2.13.0, released on 27 March 2018.
 
 ### Features