Set default branch on codecov and new badge

Author: TomHAnderson

README.md

@@ -9,7 +9,7 @@ Laravel Doctrine ORM
 An integration library for Laravel and Doctrine ORM
 
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+[![Code Coverage](https://codecov.io/gh/laravel-doctrine/orm/graph/badge.svg?token=3CpQzDXOWX)](https://codecov.io/gh/laravel-doctrine/orm)
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