Updates php/challenge-98.md

CHYbeta · CHYbeta · commit 45dae47a5f79 · 2018-11-17T09:14:12.000+08:00
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diff --git a/php/challenge-98.md b/php/challenge-98.md
@@ -16,4 +16,4 @@ call_user_func($b,$a);
 ```
 
 # Refference
-+ LCTF 2018
++ LCTF 2018 bestphp's revenge
