Update README.md

Author: ferishili

README.md

@@ -3,7 +3,7 @@ This PHP composer package is meant to provide a unified easy-to-use Opencast RES
 Please refer to the [Change Log](https://github.com/elan-ev/opencast-php-library/blob/master/CHANGELOG.md) for more info.
 
 ## Note
-As of version 1.2.0 the main class name has been changed from `OpenCast` to `OpenCast`. Please refer to [Upgrade Log](https://github.com/elan-ev/opencast-php-library/blob/master/UPGRADING.md) for more info.
+As of version 1.2.0 the main class name has been changed from `OpenCast` to `Opencast`. Please refer to [Upgrade Log](https://github.com/elan-ev/opencast-php-library/blob/master/UPGRADING.md) for more info.
 
 # Requisitions
 <b>PHP Version 7.2.5 or above</b> as well as <b>cURL</b> are required. Additionaly, the [requirements](https://docs.guzzlephp.org/en/stable/overview.html#requirements) of [guzzlehttp/guzzle](https://packagist.org/packages/guzzlehttp/guzzle#7.0.0) must be fullfiled.