change doclint config

pom.xml

-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>org.knowm.xchart</groupId>
@@ -156,17 +157,9 @@
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-javadoc-plugin</artifactId>
 				<version>2.10.3</version>
-				<executions>
-					<execution>
-						<id>attach-javadocs</id>
-						<goals>
-							<goal>jar</goal>
-						</goals>
-						<configuration>
-							<additionalparam>-Xdoclint:none</additionalparam>
-						</configuration>
-					</execution>
-				</executions>
+				<configuration>
+					<additionalparam>-Xdoclint:none</additionalparam>
+				</configuration>
 			</plugin>
 			<!-- for deploying to Maven Central -->
 			<plugin>