message: docs(readme): add data and classname options to edge
diff: @@ -272,6 +272,7 @@ If you wanted to display this edge, you would need a node with id = 1 (source no
  - `type`: 'input', 'output', 'default' or a custom one you implemented
  - `animated`: boolean
  - `style`: css properties for the edge line path
  +- `className`: additional class name
  - `label`: string
  - `labelStyle`: css properties for the text
  - `labelShowBg`: boolean - default: `true`
  @@ -279,6 +280,7 @@ If you wanted to display this edge, you would need a node with id = 1 (source no
  - `arrowHeadType`: 'arrow' or 'arrowclosed' - defines the arrowhead of the edge
  - `markerEndId`: custom marker end url - if this is used `arrowHeadType` gets ignored
  - `isHidden`: if `true`, the edge will not be rendered
  +- `data`: {} you can use this to pass data to your custom edges.
  You can find an example with different edges in the [edges example](https://reactflow.dev/edges).
  