updated for version 7.3.691

Problem:    State specific to the Python thread is discarded.
Solution:   Keep state between threads. (Paul)

src/version.c

@@ -719,6 +719,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    691,
 /**/
     690,
 /**/