Update README.md

vishalratna-microsoft · web-flow · commit 5348a27feead · 2022-02-25T16:36:02.000+05:30
diff --git a/README.md b/README.md
@@ -20,6 +20,7 @@
 7. Designed to be thread safe & null safe  
 8. Rich API  
 9. Fully documented, just run java docs!  
+10. Thread safe
   
 # Vocabulary  
   
