Merge pull request #835 from rcalago/master

Update on README.md

Author: lor6

core-kotlin-modules/core-kotlin-8/README.md

@@ -5,4 +5,5 @@
 - [Kotlin TODO() Function](https://www.baeldung.com/kotlin/todo)
 - [Comparator in Kotlin](https://www.baeldung.com/kotlin/comparator)
 - [Get the Line Number Where an Exception Was Thrown in Kotlin](https://www.baeldung.com/kotlin/exception-metadata)
+- [How to Get the Name of a Variable in Kotlin](https://www.baeldung.com/kotlin/reflection-variable-name)
 - More articles: [[<-- prev]](../core-kotlin-7)

core-kotlin-modules/core-kotlin-lang-4/README.md

@@ -11,4 +11,5 @@ This module contains articles about core features in the Kotlin language.
 - [Working With Triple in Kotlin](https://www.baeldung.com/kotlin/triple-type)
 - [equals() and hashCode() Generator in Kotlin](https://www.baeldung.com/kotlin/equals-hashcode-generator)
 - [The Implicit Name Of the Single Parameter in Lambda Expressions: it](https://www.baeldung.com/kotlin/lambda-expressions-it)
+- [Private Constructors in Kotlin](https://www.baeldung.com/kotlin/private-constructors)
 - [[<-- prev]](/core-kotlin-modules/core-kotlin-lang-3)

kotlin-testing/README.md

@@ -10,3 +10,4 @@ This module contains articles about testing in Kotlin
 - [Testing a Lambda Function With Mockito Kotlin](https://www.baeldung.com/kotlin/mockito-verify-lambda)
 - [How to Mock and Verify Lambda Expression in Kotlin](https://www.baeldung.com/kotlin/lambda-mock-verify)
 - [Testing Extension Methods in Kotlin](https://www.baeldung.com/kotlin/test-extension-methods)
+- [Using Spy in MockK](https://www.baeldung.com/kotlin/mockk-spy)