Save plot images in different formats with opts_chunks$dev
#1507
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The knitr documentation indicates that it is possible to pass a vector of target devices to save the same plot in different formats. Reticulate uses
dir.create()to create the destination directory if it doesn't exist, however this function can only accept one path and will fail with multiple target devices, asknitr::fig_path()will return a vector of 2 paths.This PR solves the issue by considering the return type of
knitr::fig_path()as a vector of strings rather than a single string and callinglapplyon functions that relies on a single element.