fixed build status badge

Author: Ralf

README.md

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-[![.github/workflows/main.yaml](https://github.com/vescon/ScriptVerifier/actions/workflows/main.yaml/badge.svg?branch=master)](https://github.com/vescon/ScriptVerifier/actions/workflows/main.yaml)
+[![.github/workflows/main.yaml](https://github.com/vescon/ScriptVerifier/actions/workflows/main.yaml/badge.svg?branch=main)](https://github.com/vescon/ScriptVerifier/actions/workflows/main.yaml)
 [![NuGet](https://img.shields.io/nuget/v/ScriptVerifier.svg)](https://www.nuget.org/packages/ScriptVerifier/)
 
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 # ScriptVerifier
 Verifies that a C# code only uses perrmitted types and assemblies