docs: Prepare version 0.4.3 release notes

Change-Id: I0b3a6166eac489be67ea03ff69a13ffe35616f63
diff --git a/docs/releases.rst b/docs/releases.rst
index 58a213d..d45e027 100644
--- a/docs/releases.rst
+++ b/docs/releases.rst
@@ -5,6 +5,7 @@
    :hidden:
    :maxdepth: 1
 
+   release-notes/release-notes-0.4.3
    release-notes/release-notes-0.4.2
    release-notes/release-notes-0.4.1
    release-notes/release-notes-0.4.0