update maven javadoc plugin version from 3.0.0 to 3.1.1

Author: irina-dragoste

pom.xml

@@ -63,7 +63,7 @@
 		<slf4j.version>1.7.10</slf4j.version>
 		<apache.commons.lang.version>3.9</apache.commons.lang.version>
 		<apache.commons.csv.version>1.5</apache.commons.csv.version>
-		<maven.javadoc.version>3.0.0</maven.javadoc.version>
+		<maven.javadoc.version>3.1.1</maven.javadoc.version>
 		<owlapi.version>4.5.1</owlapi.version>
 		<openrdf.sesame.version>2.7.16</openrdf.sesame.version>
 		<graal.version>1.3.1</graal.version>