fixed new version check

src/document/UBDocumentController.cpp

@@ -1412,7 +1412,7 @@ bool UBDocumentController::isOKToOpenDocument(UBDocumentProxy* proxy)
 
     if (docVersion.isEmpty() || docVersion.startsWith("4.1") || docVersion.startsWith("4.2")
             || docVersion.startsWith("4.3") || docVersion.startsWith("4.4") || docVersion.startsWith("4.5")
-            || docVersion.startsWith("4.6")) // TODO UB 4.7 update if necessary
+            || docVersion.startsWith("4.6") || docVersion.startsWith("4.8")) // TODO UB 4.7 update if necessary
     {
         return true;
     }