Remove unused import.

Author: garydgregory

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

@@ -36,7 +36,6 @@
 import java.io.Serializable;
 import java.io.StringWriter;
 import java.nio.charset.Charset;
-import java.nio.file.Files;
 import java.nio.file.Path;
 import java.sql.ResultSet;
 import java.sql.ResultSetMetaData;