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Update README.md

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Rudis Muiznieks 2020-05-10 10:58:58 -05:00 committed by GitHub
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@ -20,3 +20,5 @@ Takes optional `options` configuration object:
- `canvasId`: optional id of an existing canvas to apply the effect to
If no existing `canvasId` is provided then the effect will be applied to the entire browser screen.
You can animate alpha changes with `fg.setAlpha(newValue, step)` where `step` is optional and will determine how quickly the fade in/out will occur.