plotly 4.12.1

Improvements

• Completed the plot_ly() documentation for what happens when type is not
  specified (#2362).

• Removed the dependency on the {lazyeval} package.

Bug fixes

• Closed #2483: save_image() no longer embeds Windows file paths directly into Python source passed to reticulate, fixing static image export with Kaleido on Windows.

• #2495: ggplotly() now keeps merged legend titles in sync with their legend entries, fixing a case where an upstream change in {rlang}'s hashing could silently reorder combined legend titles (e.g. factor(vs)<br />factor(cyl)) out of step with the entries they label.