Missing MarketPlace image on main readme.md

[OzBob]

https://github.com/microsoft/vscode-wordcount/blob/main/README.md
When viewed in github, the image "images/wordcount.gif" does appear in github repo.

But on the VSMarketplace , and in VSCode the image is missing. The URL it is expecting is:

https://github.com/Microsoft/vscode-wordcount/raw/master/images/wordcount.gif