Merge pull request #75 from johnA1331/master

github-related test fix (results: 03.05.2020) - BAEL-24010

Author: eric-martin

core-scala/README.md

@@ -14,3 +14,7 @@ This module contains articles about Scala's core features
 - [Introduction to Testing With ScalaTest](https://www.baeldung.com/scala/scalatest)
 - [For Loops in Scala](https://www.baeldung.com/scala/for-loops)
 - [A Guide to Sorting in Scala](https://www.baeldung.com/scala/sorting)
+- [An Introduction to Scala Extractor Objects](https://www.baeldung.com/scala/extractor-objects)
+- [A Comprehensive Guide to For-Comprehension in Scala](https://www.baeldung.com/scala/for-comprehension)
+- [Introduction to Traits in Scala](https://www.baeldung.com/scala/traits)
+- [Currying in Scala](https://www.baeldung.com/scala/currying)