Release notes for v3.0.4

Signed-off-by: Cary Phillips <[email protected]>

CHANGES.md

@@ -1,6 +1,7 @@
 # OpenEXR Release Notes
 
 
+* [Version 3.0.4](#version-303-june-2-2021) June 2, 2021
 * [Version 3.0.3](#version-303-may-18-2021) May 18, 2021
 * [Version 3.0.2](#version-302-may-17-2021) May 17, 2021
 * [Version 3.0.1](#version-301-april-1-2021) April 1, 2021
@@ -47,6 +48,14 @@
 * [Version 1.0.1](#version-101)
 * [Version 1.0](#version-10)
 
+## Version 3.0.4 (June 2, 2021)
+
+Patch release that corrects a problem with the release version number
+of v3.0.2/v3.0.3:
+
+* [1025](https://github.com/AcademySoftwareFoundation/openexr/pull/1025) Set OPENEXR_VERSION from OpenEXR_VERSION variables
+* [1028](https://github.com/AcademySoftwareFoundation/openexr/pull/1028) Fix break of OpenEXRConfig.h generation after PR 1025
+
 ## Version 3.0.3 (May 18, 2021)
 
 Patch release that fixes a regression in v3.0.2 the prevented headers