fixed another javadoc issue

library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDImporter.java

@@ -235,7 +235,7 @@ public class ZUGFeRDImporter {
 
 	/***
 	 * Wrapper for protected method extractString
-	 * @param xpathStr
+	 * @param xpathStr the xpath expression to be evaluated
 	 * @return the extracted String for the specific path in the document
 	 */
 	public String wExtractString(String xpathStr) {

pom.xml

@@ -60,7 +60,7 @@
             </plugin>
             <plugin>
                 <artifactId>maven-deploy-plugin</artifactId>
-                <version>2.8.2</version>
+                <version>3.0.0-M1</version>
                 <configuration>
                     <altDeploymentRepository>internal.repo::default::file://${project.build.directory}/mvn-repo
                     </altDeploymentRepository>
@@ -102,7 +102,7 @@
             <plugin>
                 <groupId>org.sonatype.plugins</groupId>
                 <artifactId>nexus-staging-maven-plugin</artifactId>
-                <version>1.6.7</version>
+                <version>1.6.8</version>
                 <extensions>true</extensions>
                 <configuration>
                     <serverId>ossrh</serverId>