chg: added stix attribute export

20210902-NATO-MUG-update/content.tex

@@ -122,6 +122,7 @@
         \item Comprehensive {\bf STIX 1.1.1, 1.2, 2.0, 2.1} support for ingestion and export
         \item Extraction of the MISP-STIX subsystem to a separate {\bf stand-alone library}
         \item Detailed {\bf mapping documentation}
+        \item STIX export on the attribute scope in addition to the event scope
         \item \url{https://github.com/MISP/misp-stix}
 \end{itemize}
 \end{frame}