Update javascript-quiz.md (Ebazhanov#500)

Added question Q55 Co-authored-by: Evgenii <[email protected]>
Tristen-e · Oct 6, 2020 · 649975b · 649975b
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diff --git a/javascript/javascript-quiz.md b/javascript/javascript-quiz.md
@@ -494,12 +494,11 @@ console.log(sayHello.prototype);
 * an object with a constructor property
 * an error message
 
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+### Q55: Which collection object allows unique value to be inserted only once? 
+* Object
+* Set <<<---CORRECT
+* Array
+* Map