Bump maven-jxr-plugin from 2.3 to 3.0.0 (#49)

Author: dependabot[bot]

pom.xml

@@ -822,7 +822,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-jxr-plugin</artifactId>
-                <version>2.3</version>
+                <version>3.0.0</version>
             </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>