geom_GeomFlow() not implemented 

Hello, I wanted to make a geom_flow ggplot interactive but got the error that it has not yet been implemented. That would be really appreciated if it could be! 
---
A brief summary. of my code, I also use geom_stratum()

```r
ggplot(df,
       aes(x = x, stratum = place, alluvium = group,
           y = n)) +
  geom_flow() +
  geom_stratum()
```
