Options to disable top and bottom frames

[halostatue]

The Text renderer is really close to being able to produce a GFM table:

Table.new(rows, header)
|> Table.render!(intersection_symbol: "|", top_frame_symbol: nil, bottom_frame_symbol: nil)
|> IO.puts()

If instead we could add top_frame: false and bottom_frame: false, then we would absolutely have a GFM table.

The workaround is similar to that in #14:

rows
|> Table.new(header)
|> Table.render!(intersection_symbol: "|")
|> String.trim_trailing("\n")
|> String.split("\n")
|> List.delete_at(0)
|> List.delete_at(-1)
|> Enum.join("\n")
|> IO.puts()

[djm]

Closing, as merging #59.