iheatmapr doesn't work when on the same HTML page as a standard plotly widget

If you include a normal plotly htmlwidget and an iheatmapr instance then neither is displayed, because of conflicting plotly version. You can fix this by upgrading to plotly 2.16. Breaking changes seem minimal

---
title: Reproducing plotly problem with iheatmapr and htmlwidgets
output: html_document
---

```{r libs, message = FALSE, warning = FALSE, results = "hide"}
library("plotly")
library("iheatmapr")
```

```{r plotly}
plot_ly(economics, x = ~pop)
```     

```{r iheatmapr}
iheatmap(as.matrix(mtcars))
```

ropensci / iheatmapr

iheatmapr doesn't work when on the same HTML page as a standard plotly widget #94