Updated RELEASE_NOTES.

RELEASE_NOTES.md

@@ -16,7 +16,7 @@ Ensure actors' public key PEM never includes anything after the end marker.
 
 Fixed some memory leaks (contributed by inz).
 
-Updated French, Brazilian Portuguese translations (contributed by dragondaddy, daltux).
+Updated French, Brazilian Portuguese, German translations (contributed by dragondaddy, daltux, zen).
 
 ## 2.92