MIME4J-289 Upgrade maven-jar-plugin 2.4 -> 3.1.2
diff --git a/pom.xml b/pom.xml
index 8074de0..d96bb36 100644
--- a/pom.xml
+++ b/pom.xml
@@ -185,7 +185,7 @@
             </plugin>
             <plugin>
                 <artifactId>maven-jar-plugin</artifactId>
-                <version>2.4</version>
+                <version>3.1.2</version>
                 <executions>
                     <execution>
                         <id>jar</id>