chore: prepare release notes for 0.4.0

Midnighter · Midnighter · commit 7244a090f069 · 2021-02-05T15:34:56.000+01:00
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
@@ -4,6 +4,9 @@ History
 
 Next Release
 ------------
+
+0.4.0 (2021-02-05)
+------------------
 * Fix: Don't duplicate relationships if ``add_nearest_neighbours()`` called twice (#63)
 * Fix: Support blank diagrams descriptions from the Structurizr UI (#40)
 * Fix: External boundaries visible flag in ContainerView now preserved in JSON (#67)
