Update kotlin-quiz.md (Ebazhanov#1143)

Q16 answer added with ref. Co-authored-by: Evgenii <[email protected]>
Tristen-e · Feb 14, 2021 · c4533e0 · c4533e0
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diff --git a/kotlin/kotlin-quiz.md b/kotlin/kotlin-quiz.md
@@ -186,6 +186,7 @@ println(set.count())
 
 - [ ] 3
 - [x] 4
+[reference](https://zetcode.com/kotlin/sets/)
 - [ ] 1
 - [ ] 5