Added TOML header to prob.md for time-traveler question

Author: TianLangHin

competition/time-traveler/prob.md

@@ -1,4 +1,17 @@
-# Time Traveler's Trading Company
+---toml
+[fuzz]
+exec = ["./time-traveler", "generate"]
+env = {}
+
+[judge]
+exec = ["./time-traveler", "verify"]
+
+[problem]
+points = 15
+difficulty = 2
+---
+
+# ⏰ Time Traveler's Trading Company
 
 Congratulations, you've built a working time machine. You have so many ideas in changing the past for the betterment of our world. But messing with the past can be dangerous, especially for those you care about. So instead of altering major events, you decide to do something subtle: hacking the stock market.