Update README.md

Signed-off-by: Kaveen Kumarasinghe <k5kumara@uwaterloo.ca>

README.md

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-![Docker](https://github.com/Kav-K/GPT3Discord/actions/workflows/docker_upload.yml/badge.svg)  
+![Docker](https://github.com/Kav-K/GPT3Discord/actions/workflows/build-and-publish-docker.yml/badge.svg)  
 ![PyPi](https://github.com/Kav-K/GPT3Discord/actions/workflows/pypi_upload.yml/badge.svg)  
 ![Build](https://github.com/Kav-K/GPT3Discord/actions/workflows/build.yml/badge.svg)  
   
@@ -180,4 +180,4 @@ This bot supports per-user custom indexes. This means that users can upload file
 If you follow the link above, you will now get to detailed step-by-step guides that will help you to install and set up your GPT3Discord bot and its features quickly and easily. If you still run into problems or have suggestions for improving the guides, you can join the [**Discord-Server**](https://discord.gg/WvAHXDMS7Q) and we will try to help you. Keep in mind that the maintainers are volunteers and will try to help you on their schedule.  
   
 *The number and content of the guides is constantly adapted to current requirements.*  
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