fix logic error

Author: fuhrysteve

pyexcel_io/csvbook.py

@@ -237,7 +237,7 @@ def close(self):
         """
         This call close the file handle
         """
-        if not (isinstance(self.f, StringIO) and isinstance(self.f, BytesIO)):
+        if not (isinstance(self.f, StringIO) or isinstance(self.f, BytesIO)):
             self.f.close()
         elif not self.single_sheet_in_book:
             self.f.write("---pyexcel---\r\n")