better formatting of the error text

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@433796 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -157,7 +157,7 @@ public class ExecTask extends Task {
      * @ant.attribute ignore="true"
      */
     public void setCommand(Commandline cmdl) {
-        log("The command attribute is deprecated. "
+        log("The command attribute is deprecated.\n"
             + "Please use the executable attribute and nested arg elements.",
             Project.MSG_WARN);
         this.cmdl = cmdl;