Update release notes for 0.103.7 patch version

Author: val-ms

NEWS.md

@@ -7,7 +7,12 @@ Note: This file refers to the source tarball. Things described here may differ
 
 ClamAV 0.103.7 is a critical patch release with the following fixes:
 
--
+- Upgrade the vendored UnRAR library to version 6.1.7.
+
+- Fix logical signature "Intermediates" feature.
+
+- Relax constraints on slightly malformed zip archives that contain overlapping
+  file entries.
 
 ## 0.103.6