Fix formatting by removing extra blank line

Removed an extra blank line in the README file.

Author: a-gubskiy

README.md

@@ -4,7 +4,6 @@
 [![Subscribe on X](https://img.shields.io/badge/Subscribe_on_X-000000?logo=x&logoColor=white&style=for-the-badge)](https://x.com/andrew_gubskiy)
 [![NuGet Downloads](https://img.shields.io/nuget/dt/X.Web.Sitemap?style=for-the-badge&label=NuGet%20Downloads&color=004880&logo=nuget&logoColor=white)](https://www.nuget.org/packages/X.Web.Sitemap)
 
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 X.Web.Sitemap is a library for generating and managing sitemaps in .NET applications.
 
 ## Usage example