Update README.md

Author: ratajs

README.md

@@ -1,6 +1,6 @@
  Simon's MySQL
 ======
-smysql-old-1.php is for PHP 5.3 and earlier versions (required [MySQL extension](http://php.net/manual/en/book.mysql.php)).
+smysql-old-1.php is for PHP 5.3 and earlier versions (required [MySQL library](http://php.net/manual/en/book.mysql.php)).
 <br />
-smysql.php is for PHP 5.4 and later versions (required [MySQLi extension](http://php.net/manual/en/book.mysqli.php)).<br />
+smysql.php is for PHP 5.4 and later versions (required [MySQLi library](http://php.net/manual/en/book.mysqli.php)).<br />
 <a href="http://ratajs.nhx.cz/SimonMySQL_manual/?lang=en">Here</a> or <a href="https://github.com/ratajs/Simon-MySQL/wiki">here</a> is documentation.