Update README.md (eugenp#3044)

Author: pivovarit

logging-modules/log4j/README.md

@@ -2,6 +2,5 @@
 - [Introduction to Java Logging](http://www.baeldung.com/java-logging-intro)
 - [Introduction to SLF4J](http://www.baeldung.com/slf4j-with-log4j2-logback)
 - [Generate equals() and hashCode() with Eclipse](http://www.baeldung.com/java-eclipse-equals-and-hashcode)
-- [A Guide To Java Regular Expressions API](http://www.baeldung.com/regular-expressions-java)
 - [Introduction to SLF4J](http://www.baeldung.com/slf4j-with-log4j2-logback)
 - [A Guide to Rolling File Appenders](http://www.baeldung.com/java-logging-rolling-file-appenders)