Update README.md

Author: isarpila

README.md

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 # UpCloud WHMCS module
 
 This is a module for adding UpCloud integration onto the WHMCS web hosting platform.
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+**NOTE:** this module is an experimental one and not officially supported by UpCloud. If you notice anything not working as it should please open a new github -issue.
 ## Table of content
 * [Installation](#installation)
 * [Usage](#usage)