Fix checkstyle: remove tabs

Author: aherbert

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

@@ -1686,7 +1686,7 @@ private void validate() throws IllegalArgumentException {
      * @since 1.7
      */
     public CSVFormat withAllowDuplicateHeaderNames() {
-    	return withAllowDuplicateHeaderNames(true);
+        return withAllowDuplicateHeaderNames(true);
     }
 
     /**
@@ -1697,7 +1697,7 @@ public CSVFormat withAllowDuplicateHeaderNames() {
      * @since 1.7
      */
     public CSVFormat withAllowDuplicateHeaderNames(final boolean allowDuplicateHeaderNames) {
-    	return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
+        return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
                 ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
                 skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
                 allowDuplicateHeaderNames);

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

@@ -520,9 +520,9 @@ private Headers createHeaders() throws IOException {
             }
         }
         if (headerNames == null) {
-        	headerNames = Collections.emptyList(); //immutable
+            headerNames = Collections.emptyList(); //immutable
         } else {
-        	headerNames = Collections.unmodifiableList(headerNames);
+            headerNames = Collections.unmodifiableList(headerNames);
         }
         return new Headers(hdrMap, headerNames);
     }