Add er.comment for add comment to ER diagram

[k1LoW]

Fix #121

# .tbls.yml
er:
  skip: false
  format: svg
  # Add table/column comment to ER diagram
  # Default is false
  comment: true

[codecov]

Codecov Report

Merging #122 into master will decrease coverage by 0.21%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #122      +/-   ##
==========================================
- Coverage   72.58%   72.37%   -0.22%     
==========================================
  Files          12       12              
  Lines        2510     2534      +24     
==========================================
+ Hits         1822     1834      +12     
- Misses        522      534      +12     
  Partials      166      166

Impacted Files	Coverage Δ
config/config.go	46.45% <ø> (ø)	⬆️
output/dot/dot.go	61.9% <66.66%> (-2.81%)	⬇️
output/plantuml/plantuml.go	64.7% <66.66%> (-2.42%)	⬇️

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[k1LoW]

[k1LoW]