Remove unused private fields

Author: pzygielo

src/main/java/org/codehaus/mojo/buildhelper/AttachArtifactMojo.java

@@ -27,7 +27,6 @@
 import java.util.HashSet;
 import java.util.Set;
 
-import org.apache.maven.execution.MavenSession;
 import org.apache.maven.plugin.AbstractMojo;
 import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugin.MojoFailureException;
@@ -55,22 +54,6 @@ public class AttachArtifactMojo
  @Parameter( required = true )
  private Artifact[] artifacts;
 
- /**
- * This project's base directory.
- *
- * @since 1.5
- */
- @Parameter( defaultValue = "${basedir}" )
- private String basedir;
-
- /**
- * The Maven Session.
- *
- * @since 1.5
- */
- @Parameter( readonly = true, defaultValue = "${session}" )
- private MavenSession mavenSession;
-
  @Parameter( readonly = true, defaultValue = "${project}" )
  private MavenProject project;