Update README.md

Author: johnA1331

testing-modules/testing-libraries-2/README.md

@@ -3,3 +3,4 @@
 - [Guide to the System Rules Library](https://www.baeldung.com/java-system-rules-junit)
 - [Guide to the System Stubs Library](https://www.baeldung.com/java-system-stubs)
 - [Code Coverage with SonarQube and JaCoCo](https://www.baeldung.com/sonarqube-jacoco-code-coverage)
+- [Exclusions from Jacoco Report](https://www.baeldung.com/jacoco-report-exclude)