Add data frame RFC#3

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sophiajt wants to merge 3 commits intonushell:mainfrom

sophiajt:data_frame

Commits on Aug 5, 2020

Add data frame RFC
sophiajt
committed
Update and rename 0000-data-frames.md to 0003-data-frames.md
Jonathan Turner
authored
Update 0003-data-frames.md
Jonathan Turner
authored