How do you enforce lowercase routing in ASP.NET Core?

For ASP.NET Core:

Add one of the following lines to the ConfigureServices method of the Startup class:

services.AddRouting(options => options.LowercaseUrls = true);

or

services.Configure<RouteOptions>(options => options.LowercaseUrls = true); 

Thanks to Skorunka for the answer as a comment. I thought it was worth promoting to an actual answer.