#307 Replace dashes with underscores (13-looking-up-data.md)

[mahdi-robbani]

Addresses Issue #307

Column names with a dash in them have been replaced with underscores.

[github-actions[bot]]

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[ostephens]

Looks great @mahdi-robbani - thanks very much!

Just for clarity - did you check through all episodes for column naming or just 13/looking up data?

[mahdi-robbani]

Just 13-looking-up-data