chore: update badge

Author: thinkingserious

README.md

@@ -1,6 +1,6 @@
 ![SendGrid Logo](twilio_sendgrid_logo.png)
 
-[![Travis Badge](https://travis-ci.org/sendgrid/csharp-http-client.svg?branch=main)](https://travis-ci.org/sendgrid/csharp-http-client)
+[![Travis Badge](https://travis-ci.com/sendgrid/csharp-http-client.svg?branch=main)](https://travis-ci.com/sendgrid/csharp-http-client)
 [![NuGet](https://img.shields.io/nuget/v/SendGrid.CSharp.Http.Client.svg)](https://www.nuget.org/packages/SendGrid.CSharp.HTTP.Client)
 [![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 [![Twitter Follow](https://img.shields.io/twitter/follow/sendgrid.svg?style=social&label=Follow)](https://twitter.com/sendgrid)