Implementation of ggalt::geom_encircle()

Good evening,

• I will say first thank for the awesome packages and more for the R community, this is just awesome !

• I have found a topic yet not covered by the plotly package. You will find bellow a reprex with the error message.

library(magrittr)
library(ggplot2)
gp <- iris %>% 
        ggplot(. , aes(x = Sepal.Length, y = Sepal.Width, colour = Species)) +
        geom_point() +
        ggalt::geom_encircle()
plotly::ggplotly(gp)

Warning messages:
1: In geom2trace.default(dots[[1L]][[3L]], dots[[2L]][[1L]], dots[[3L]][[1L]]) :
  geom_GeomEncircle() has yet to be implemented in plotly.
  If you'd like to see this geom implemented,
  Please open an issue with your example code at
  https://github.com/ropensci/plotly/issues
2: In geom2trace.default(dots[[1L]][[3L]], dots[[2L]][[1L]], dots[[3L]][[1L]]) :
  geom_GeomEncircle() has yet to be implemented in plotly.
  If you'd like to see this geom implemented,
  Please open an issue with your example code at
  https://github.com/ropensci/plotly/issues
3: In geom2trace.default(dots[[1L]][[3L]], dots[[2L]][[1L]], dots[[3L]][[1L]]) :
  geom_GeomEncircle() has yet to be implemented in plotly.
  If you'd like to see this geom implemented,
  Please open an issue with your example code at
  https://github.com/ropensci/plotly/issues

Inizia eseguendo il reprex R fornito con ggplot2, ggalt::geom_encircle() e plotly::ggplotly(), quindi ispeziona il percorso geom2trace.default indicato nell'avviso. Il lavoro è completato quando l'esempio non segnala più che geom_GeomEncircle() non è implementato e il grafico con il contorno viene renderizzato tramite plotly.