Insert a space.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@276651 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/optional/ANTLR.java

@@ -289,7 +289,7 @@ public class ANTLR extends Task {
             }
         } else {
             log("Skipped grammar file. Generated file " + generatedFile
-                + "is newer.", Project.MSG_VERBOSE);
+                + " is newer.", Project.MSG_VERBOSE);
         }
     }