Update plugins, fix warning

Author: robinst

pom.xml

@@ -13,10 +13,6 @@
     </description>
     <url>https://github.com/robinst/autolink-java</url>
 
-    <prerequisites>
-        <maven>3.1.0</maven>
-    </prerequisites>
-
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <jmh.version>1.19</jmh.version>
@@ -51,7 +47,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-jar-plugin</artifactId>
-                <version>3.0.2</version>
+                <version>3.1.0</version>
                 <configuration>
                     <archive>
                         <manifestEntries>
@@ -181,7 +177,7 @@
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-javadoc-plugin</artifactId>
-                        <version>2.10.4</version>
+                        <version>3.0.1</version>
                         <executions>
                             <execution>
                                 <id>attach-javadocs</id>