Add output of the header array to toString implementation

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/csv/trunk@1522890 13f79535-47bb-0310-9956-ffa450edef68

Author: britter

src/main/java/org/apache/commons/csv/CSVFormat.java

@@ -600,6 +600,10 @@ public String toString() {
             sb.append(" SurroundingSpaces:ignored");
         }
         sb.append(" SkipHeaderRecord:").append(skipHeaderRecord);
+        if (header != null) {
+            sb.append(' ');
+            sb.append("Header:").append(Arrays.toString(header));
+        }
         return sb.toString();
     }