docs(readme): use main branch for badges

Author: maartenpaauw

README.md

@@ -1,9 +1,9 @@
 # Laravel specification pattern
 
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+[![GitHub Tests Action Status](https://img.shields.io/github/actions/workflow/status/maartenpaauw/laravel-specification-pattern/run-tests.yml?branch=main&label=tests&style=flat-square)](https://github.com/maartenpaauw/laravel-specification-pattern/actions?query=workflow%3Arun-tests+branch%3Amain)
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 Filter an Illuminate collection with specifications.