Update README.txt

README.txt

 PLEASE READ:
 -----------
 There are 3 versions of this extension available.  This is:
-4.3:  Extension for CiviCRM 4.3.
-You do not need the CMS module for 4.3
+4.4:  Extension for CiviCRM 4.4.
+You do not need the CMS module for 4.4
 
 IMPORTANT:
 ---------
-In 4.3 the Webhook.php file is registered to the path of civicrm/stripe/webhook
+In 4.4 the Webhook.php file is registered to the path of civicrm/stripe/webhook
 You have to make a Webhook rule in your Stripe account and enter the path to Webhook.php for recurring charges to end!
 
 INSTALLATION INSTRUCTIONS:
 -------------------------
-For CiviCRM 4.3:
+For CiviCRM 4.4:
 1)  Install extension
 2)  Copy Stripe's PHP library folder 'stripe-php' to civicrm/packages/stripe-php
 You can get Stripe's PHP library here: https://github.com/stripe/stripe-php