Update README.md

Author: ANcpLua

README.md

@@ -3,7 +3,7 @@
 [![codecov](https://codecov.io/gh/ANcpLua/CreatePdf.NET/branch/main/graph/badge.svg?token=lgxIXBnFrn)](https://codecov.io/gh/ANcpLua/CreatePdf.NET)
 [![.NET](https://img.shields.io/badge/.NET-10.0_Preview-512BD4)](https://dotnet.microsoft.com/download/dotnet/10.0)
 [![NuGet](https://img.shields.io/nuget/v/CreatePdf.NET?label=NuGet&color=blue)](https://www.nuget.org/packages/CreatePdf.NET/)
-[![License](https://img.shields.io/github/license/ANcpLua/CreatePdf.NET?label=License&color=blue)](https://github.com/ANcpLua/CreatePdf.NET/blob/master/LICENSE)
+[![License](https://img.shields.io/github/license/ANcpLua/CreatePdf.NET?label=License&color=blue)](https://github.com/ANcpLua/CreatePdf.NET/blob/main/LICENSE)
 
 A simple, .NET library for PDF creation with text and bitmap rendering, plus [optional OCR functionality](#to-enable-ocr-functionality) for text extraction.