fix readme

Author: pedrorijo91

scala-core-collections-modules/scala-core-collections-4/README.md

@@ -1,4 +1,3 @@
 ## Relevant Articles
 - [Using filter() and takeWhile() With Collections in Scala](https://www.baeldung.com/scala/filter-takewhile)
 - [Finding Elements in a List using takeWhile() and dropWhile() in Scala](https://www.baeldung.com/scala/list-find-takewhile-dropwhile)
-- [Calculate the Average of a List in Scala](https://www.baeldung.com/scala/calculate-the-average-of-a-list-in-scala)