Corrected release date

Signed-off-by: Matthias Koller <m.koller@peak-solution.de>
diff --git a/release_notes.md b/release_notes.md
index f8081c1..ed27664 100644
--- a/release_notes.md
+++ b/release_notes.md
@@ -4,7 +4,7 @@
 * [mdmbl Eclipse Git Repositories](http://git.eclipse.org/c/?q=mdmbl)
 * [mdmbl nightly builds - last stable version](http://download.eclipse.org/mdmbl/nightly_master/?d)
 
-## Version 5.1.0M8, 2019/11/22 ##
+## Version 5.1.0M8, 2020/02/03 ##
 
 New Features:
 * Add Quantity and Unit in Detail-View in WebClient