Merge pull request #873 from datacarpentry/frog-update-slack-links · datacarpentry/R-ecology-lesson@0faf1bf

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[missing file]: [code handout](files/code-handout.R)

[uninformative link text]: [here](https://stat.ethz.ch/R-manual/R-devel/library/base/html/Reserved.html)

[uninformative link text]: [here](https://tibble.tidyverse.org/)

[image missing alt-text]: ./fig/data-frame.svg

[uninformative link text]: [here](https://www.tidyverse.org/)

[image missing alt-text]: fig/tidyr-pivot_wider_longer.gif

[image missing alt-text]: fig/pivot_wider_graphic.png

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