Fix the broken ascii arts

Seulgi Kim · kseo · commit 0a58fc06aa70 · 2019-05-09T12:08:32.000+09:00
diff --git a/spec/Dynamic-Validator.md b/spec/Dynamic-Validator.md
@@ -15,7 +15,7 @@
 
 
 ## FSM of Account States
-`
+```
                                    +--------+
                         /--------->| Banned |<---+-------\
                         |          +--------+    |       |
