fix inconsistency in log levels.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@271423 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/Zip.java

@@ -143,7 +143,7 @@ public class Zip extends MatchingTask {
             Project.MSG_ERR);
 
         log("Be aware that the effect of using the file attribute depends on",
-            Project.MSG_ERR);
+            Project.MSG_WARN);
         log("the phase of the moon.", Project.MSG_WARN);
         int phase = DateUtils.getPhaseOfMoon(Calendar.getInstance());
         if (phase == 4) {