Fix link to the MinimalApis.Extensions project (#36)

Author: gldraphael

README.md

@@ -12,7 +12,7 @@ Install the library from [NuGet](https://www.nuget.org/packages/MiniValidation):
 ```
 
 ### ASP.NET Core 6+ Projects
-If installing into an ASP.NET Core 6+ project, consider using the [MinimalApis.Extensions]((https://www.nuget.org/packages/MinimalApis.Extensions)) package instead, which adds extensions specific to ASP.NET Core:
+If installing into an ASP.NET Core 6+ project, consider using the [MinimalApis.Extensions](https://www.nuget.org/packages/MinimalApis.Extensions) package instead, which adds extensions specific to ASP.NET Core:
 ``` console
 ❯ dotnet add package MinimalApis.Extensions --prerelease
 ```