Added Codecov badge

Signed-off-by: alexmerlin <alex.merlin.1985@gmail.com>

Author: alexmerlin

README.md

@@ -13,6 +13,7 @@ This package can clean up your code, by getting rid of all the factories you wri
 [![GitHub license](https://img.shields.io/github/license/dotkernel/dot-annotated-services)](https://github.com/dotkernel/dot-annotated-services/blob/4.0/LICENSE.md)
 
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 [![SymfonyInsight](https://insight.symfony.com/projects/a0d7016e-fc3f-46b8-9b36-571ff060d744/big.svg)](https://insight.symfony.com/projects/a0d7016e-fc3f-46b8-9b36-571ff060d744)