could not find function "plotlyMainBundlePath"  when trying to run save_image

When trying to run `save_image()` using the latest development version of plotly I get the error
``` r
 Error in plotlyMainBundlePath() : 
  could not find function "plotlyMainBundlePath" 
```

```r
remotes::install_github("ropensci/plotly")
save_image(plot_ly(), "temp.png")
```
