Update README.md

Author: Luis-Sejer

README.md

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 This is [SendinBlue](https://www.sendinblue.com) provided API V2 Symfony Bundle. It implements the various exposed APIs that you can read more about on https://apidocs.sendinblue.com.
 
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+THIS IS FORKED FROM https://github.com/mailin-api/sendinblue-api-bundle
 ## Prerequisites
 
 This version of the bundle requires Symfony 2.x OR 3.x.