Bugfix/Corrected the main branch ref in the coverage badge.

Author: othercodes

README.md

@@ -1,7 +1,7 @@
 # Criteria (a.k.a Filter)
 
 [![Test](https://github.com/ComplexHeart/php-criteria/actions/workflows/test.yml/badge.svg)](https://github.com/ComplexHeart/php-criteria/actions/workflows/test.yml)
-[![codecov](https://codecov.io/gh/ComplexHeart/php-criteria/branch/master/graph/badge.svg?token=T86pvAqfl6)](https://codecov.io/gh/ComplexHeart/php-criteria)
+[![codecov](https://codecov.io/gh/ComplexHeart/php-criteria/branch/main/graph/badge.svg?token=T86pvAqfl6)](https://codecov.io/gh/ComplexHeart/php-criteria)
 
 Small implementation of a filter criteria pattern in PHP for Complex Heart SDK. Compose several filters using fluent
 interface.