docs(README): Build badge with correct branch

Author: gcarreno

Diff for: README.md

@@ -1,6 +1,6 @@
 # LevelDB for Object Pascal
 
-[![Build Status](https://github.com/ObjectPascal-Community/LevelDB-ObjectPascal/actions/workflows/main.yml/badge.svg?branch=master)](https://github.com/ObjectPascal-Community/LevelDB-ObjectPascal/actions)
+[![Build Status](https://github.com/ObjectPascal-Community/LevelDB-ObjectPascal/actions/workflows/main.yml/badge.svg?branch=main)](https://github.com/ObjectPascal-Community/LevelDB-ObjectPascal/actions)
 [![Supports Windows](https://img.shields.io/badge/support-Windows-blue?logo=Windows)](https://github.com/ObjectPascal-Community/LevelDB-ObjectPascal/releases/latest)
 [![Supports Linux](https://img.shields.io/badge/support-Linux-yellow?logo=Linux)](https://github.com/ObjectPascal-Community/LevelDB-ObjectPascal/releases/latest)
 [![License](https://img.shields.io/github/license/ObjectPascal-Community/LevelDB-ObjectPascal)](https://github.com/ObjectPascal-Community/LevelDB-ObjectPascal/blob/master/LICENSE)