update readme

pyama86 · pyama86 · commit 45838875cde1 · 2020-02-20T18:17:50.000+09:00
diff --git a/README.md b/README.md
@@ -26,6 +26,7 @@ auth    required google-web-oauth.so
 KbdInteractiveAuthentication yes
 UsePAM yes
 AuthenticationMethods publickey,keyboard-interactive
+ChallengeResponseAuthentication yes
 ```
 
 ### USE SSH
