Uses https instead of http so that the badges will load (#2461)

README.md

@@ -4,8 +4,8 @@
 [![Build status](https://ci.appveyor.com/api/projects/status/cego2g42yw26th26/branch/main?svg=true)](https://ci.appveyor.com/project/github-windows/octokit-net/branch/main)
 [![codecov](https://codecov.io/gh/octokit/octokit.net/branch/main/graph/badge.svg)](https://codecov.io/gh/octokit/octokit.net)
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-[![NuGet](http://img.shields.io/nuget/v/Octokit.svg)](https://www.nuget.org/packages/Octokit)
-[![NuGet](http://img.shields.io/nuget/v/Octokit.Reactive.svg)](https://www.nuget.org/packages/Octokit.Reactive)
+[![NuGet](https://img.shields.io/nuget/v/Octokit.svg)](https://www.nuget.org/packages/Octokit)
+[![NuGet](https://img.shields.io/nuget/v/Octokit.Reactive.svg)](https://www.nuget.org/packages/Octokit.Reactive)
 
 ![logo](octokit-dotnet_2.png)