Add JAXB to Maven

[ghobona]

Java 11 no longer includes Java XML Binding (JAXB). See the release notes or the discussion thread.

To continue to use JAXB classes such as javax.xml.bind.Unmarshaller, you have to add it from Maven.

<!-- https://mvnrepository.com/artifact/javax.xml.bind/jaxb-api -->
<dependency>
    <groupId>javax.xml.bind</groupId>
    <artifactId>jaxb-api</artifactId>
    <version>2.3.0</version>
</dependency>