Updated badges

README.md

@@ -1,11 +1,12 @@
 # ph-ubl
 
-[![javadoc](https://javadoc.io/badge2/com.helger.ubl/ph-ubl-parent-pom/javadoc.svg)](https://javadoc.io/doc/com.helger.ubl/ph-ubl-parent-pom)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.helger.ubl/ph-ubl-parent-pom/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.helger.ubl/ph-ubl-parent-pom) 
+[![javadoc](https://javadoc.io/badge2/com.helger.ubl/ph-ubl-parent-pom/javadoc.svg)](https://javadoc.io/doc/com.helger.ubl/ph-ubl-parent-pom)
+[![CodeCov](https://codecov.io/gh/phax/ph-ubl/branch/master/graph/badge.svg)](https://codecov.io/gh/phax/ph-ubl)
 
 This is the readme file for version 5.x or later.
 
-Set of Java libraries for reading and writing OASIS UBL 2.0, 2.1, 2.2 and 2.3 documents.
+Set of Java libraries for reading and writing OASIS UBL 2.0, 2.1, 2.2, 2.3 and 2.4 documents.
 The following projects are contained:
 
 * **ph-ubl-testfiles** contains all UBL test files (used only in Maven test scope)