@uppy/image-editor: remove beta notice (#3877)

Remove beta notice

website/src/docs/image-editor.md

@@ -12,8 +12,6 @@ tagline: "allows users to crop, rotate, zoom and flip images that are added to U
 
 Designed to be used with the Dashboard UI (can in theory work without it).
 
-⚠ In beta.
-
 ![Screenshor of the Image Editor plugin UI in Dashboard](https://user-images.githubusercontent.com/1199054/87208710-654db400-c307-11ea-9471-6e3c6582d2a5.png)
 
 ```js