Merge pull request #1303 from rcalago/master

Update on README.md

Author: lor6

scala-core-modules/scala-core-9/README.md

@@ -3,3 +3,4 @@
 - [Check if a String Is a Palindrome in Scala](https://www.baeldung.com/scala/string-palindrome-test)
 - [Scala’s Destructuring with the @ Operator](https://www.baeldung.com/scala/destructuring-operator)
 - [Check if Two Strings Are Isomorphic in Scala](https://www.baeldung.com/scala/string-isomorphism)
+- [Find Two’s Complement of a Number in Scala](https://www.baeldung.com/scala/compute-twos-complement)

scala-test/README.md

@@ -14,3 +14,4 @@ This module contains articles about the ScalaTest framework in Scala.
 - [ScalaTest Assertions: A Comprehensive Guide](https://www.baeldung.com/scala/scalatest-assertions)
 - [Test for Exceptions in ScalaTest](https://www.baeldung.com/scala/scalatest-test-exceptions)
 - [Guide to Parameterized Tests in ScalaTest](https://www.baeldung.com/scala/scalatest-parameterized-tests)
+- [Building Scala Projects With Maven](https://www.baeldung.com/scala/maven)