updated read me and use proper way of getting PDO object
updated read me and use proper way of getting PDO object

vincentshiqi/laravel-oci8,walhalatur/laravel-oci8,ChaosPower/laravel-oci8-1,yajra/laravel-oci8,vyolla/laravel-oci8,Ck0814/laravel-oci8,yajra/laravel-oci8