Add markdown table formatting

[marcelbuesing]

Allows printing tables as markdown tables:

| Title 1     | Title 2    |
|-------------|------------|
| Value 1     | Value 2    |
| Value three | Value four |

Title 1	Title 2
Value 1	Value 2
Value three	Value four

[codecov]

Codecov Report

Merging #118 (b5711df) into master (6bb234c) will increase coverage by 0.17%.
The diff coverage is 93.33%.

❗ Current head b5711df differs from pull request most recent head 7c50d8d. Consider uploading reports for the commit 7c50d8d to get more accurate results

@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
+ Coverage   85.86%   86.04%   +0.17%     
==========================================
  Files           5        5              
  Lines        1323     1340      +17     
==========================================
+ Hits         1136     1153      +17     
  Misses        187      187              

Impacted Files	Coverage Δ
src/cell.rs	88.01% <75.00%> (ø)
src/row.rs	90.86% <80.00%> (ø)
src/format.rs	70.85% <100.00%> (+0.53%)	⬆️
src/lib.rs	87.85% <100.00%> (+0.30%)	⬆️

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[rami3l]

@phsym I'd love to see this feature implemented! Just being curious, what has been blocking the merge? 🤔

[sstadick]

This would still be incredibly useful!

[rami3l]

@sstadick For my project (pacaptr) I've switched to tabled which is capable of doing this.

[pinkforest]

I know it's been open for a while but if someone has time a rebase or a PR would be appreciated and get it to 0.11

nvm I fixed the conflict

[PSeitz]

Would be really nice, if that could be merged