Update to newer plexus-archiver to cope with jdk1.8
diff --git a/eclipse-signing-maven-plugin/pom.xml b/eclipse-signing-maven-plugin/pom.xml
index 9c171e3..1f6a48a 100644
--- a/eclipse-signing-maven-plugin/pom.xml
+++ b/eclipse-signing-maven-plugin/pom.xml
@@ -42,12 +42,12 @@
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-archiver</artifactId>
-      <version>2.0</version>
+      <version>3.0.1</version>
     </dependency>
      <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-utils</artifactId>
-      <version>3.0</version>
+      <version>3.0.9</version>
       <scope>compile</scope>
     </dependency>
     <dependency>