Update README.md

2020-09-17 00:09:56 +08:00 · 2020-09-17 00:09:56 +08:00 · 2cc967c01c
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 This module contains articles about core Kotlin collections.

-### Relevant articles:
-
+## Relevant articles:

+- [Aggregate Operations in Kotlin](https://www.baeldung.com/kotlin/aggregate-operations)