upgrade maven-javadoc-plugin to automate deployment

Author: worksap-bot

pom.xml

@@ -83,6 +83,11 @@
 					<encoding>${project.build.sourceEncoding}</encoding>
 				</configuration>
 			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-javadoc-plugin</artifactId>
+				<version>2.9.1</version>
+			</plugin>
 
 			<!-- Make this JAR OSGi ready -->
 			<!-- We want to keep packaging type as jar. Therefore we need to customize the MANIFEST.MF.