Fixed PHP 7.4 compatibility issue

v8.1.0

updated laravel version composer file

Added simplexml dependency to composer.json file

v8.0.5

added simple xml ddependency to composer

Fixed some codes in Pasargad RSA helpers

v8.0.4

fixed pasargas RSA class bugs

Changed all webservices schema to https

v8.0.3

changed all webservices schema to https

Changed Pasargad's API schema to https

v8.0.2

changed Pasargad Api schema to https

Fixed Pasargad form button

v8.0.1

fixed Pasargad form generator problems

Fixed bug in route parameters

Changed transaction-id to transaction_id in callback route parameters

Fixed Pasargad form with callback URLs which included query string parameters

v7.1.10

fixed Pasargad form problem with callback URL that included query str…

Added Laravel 8 support

Updated Laravel version compatibility

Fixed issue #31

Added retry to get payment token

Merge pull request #28 from miladkian/master

Add retry to get token