Update dependency org.apache.maven.plugins:maven-javadoc-plugin to v3…

….8.0

pom.xml

@@ -31,7 +31,7 @@
 		<nexus-staging-maven-plugin.version>1.7.0</nexus-staging-maven-plugin.version>
 		<maven-surefire-plugin.version>3.3.1</maven-surefire-plugin.version>
 		<maven-source-plugin.version>3.3.1</maven-source-plugin.version>
-		<maven-javadoc-plugin.version>3.7.0</maven-javadoc-plugin.version>
+		<maven-javadoc-plugin.version>3.8.0</maven-javadoc-plugin.version>
 		<maven-release-plugin.version>2.5.3</maven-release-plugin.version>
 		<maven-gpg-plugin.version>3.2.2</maven-gpg-plugin.version>
 		<maven-dependency-plugin.version>2.10</maven-dependency-plugin.version>