and one more naming change wrt #97: assume "strict headers" is the way to go

Author: cowtowncoder

src/main/java/com/fasterxml/jackson/dataformat/csv/CsvSchema.java

@@ -826,7 +826,7 @@ public CsvSchema withColumnReordering(boolean state) {
      *                  the strict headers feature.
      * @since 2.7
      */
-    public CsvSchema withStrictColumns(boolean state) {
+    public CsvSchema withStrictHeaders(boolean state) {
         return _withFeature(ENCODING_FEATURE_STRICT_HEADERS, state);
     }