Create geom_edge for work with ggraph in R

[ElliotMeador84]

---

Brief description of the problem

library(tidyverse)
library(ggraph)
library(plotly)

g <- igraph::erdos.renyi.game(25, .1)


g_graph <- ggraph(g)+
  geom_edge_fan()+
  geom_node_point()

plotly::ggplotly(g_graph)

Warning message:
In geom2trace.default(dots[[1L]][[1L]], dots[[2L]][[1L]], dots[[3L]][[1L]]) :
geom_GeomEdgePath() 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

[cpsievert]

Duplicate of #566