Update RELEASE-NOTES.md

JeroenDeDauw · web-flow · commit 44c89ee450d9 · 2020-04-19T07:48:07.000+02:00
diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
@@ -5,6 +5,8 @@ different releases and which versions of PHP and MediaWiki they support, see the
 
 ## Maps 7.18.0
 
+Released on April 19th, 2020.
+
 * Added Cagro integration: the `map` display format will now use the Maps extension
 
 ## Maps 7.17.2
