Fix HTTPS link

Author: RobThree

README.md

@@ -1,6 +1,6 @@
 # ![logo](https://raw.githubusercontent.com/RobThree/TextTableBuilder/master/logo.png) TextTableBuilder
 
-![Build Status](https://img.shields.io/github/actions/workflow/status/RobThree/IPNetworkHelper/test.yml?branch=main&style=flat-square) [![Nuget version](http://img.shields.io/nuget/v/TextTableBuilder.svg?style=flat-square)](https://www.nuget.org/packages/TextTableBuilder/)
+![Build Status](https://img.shields.io/github/actions/workflow/status/RobThree/IPNetworkHelper/test.yml?branch=main&style=flat-square) [![Nuget version](https://img.shields.io/nuget/v/TextTableBuilder.svg?style=flat-square)](https://www.nuget.org/packages/TextTableBuilder/)
 
 A simple, opinionated, modern table builder. Supports configuring how different datatypes will be formatted. Available as [Nuget package](https://www.nuget.org/packages/TextTableBuilder/)