Changed master to main in the links.

Author: dlemstra

README.md

@@ -1,6 +1,6 @@
 <h1 align="center">
 
-<img src="https://raw.githubusercontent.com/SixLabors/Branding/master/icons/imagesharp.web/sixlabors.imagesharp.web.svg?sanitize=true" alt="SixLabors.ImageSharp.Web" width="256"/>
+<img src="https://raw.githubusercontent.com/SixLabors/Branding/main/icons/imagesharp.web/sixlabors.imagesharp.web.svg?sanitize=true" alt="SixLabors.ImageSharp.Web" width="256"/>
 <br/>
 SixLabors.ImageSharp.Web
 </h1>