packs.core/README: mentio svd max version

Author: ilg-ul

plugins/org.eclipse.embedcdt.packs.core/README.txt

@@ -4,3 +4,9 @@ related plug-ins.
 The main class is org.eclipse.embedcdt.packs.core.data.DataManager.
 
 It uses several layers of caches, both on disk and in memory.
+
+---
+
+## SVD version
+
+The highest accepted SVD version is PdscUtils.highestMinorForOne.