[BREAKING] Add format.hideColumnsWithoutValues:

[k1LoW]

ref: #346

[github-actions]

Code Metrics Report

	main (902d608)	#354 (f285955)	+/-
Coverage	67.5%	64.7%	-2.8%
Code to Test Ratio	1:0.5	1:0.5	-0.0
Test Execution Time	4m18s	4m2s	-16s

Details

  |                     | main (902d608) | #354 (f285955) |  +/-  |
  |---------------------|----------------|----------------|-------|
- | Coverage            |          67.5% |          64.7% | -2.8% |
  |   Files             |             33 |             33 |     0 |
  |   Lines             |           3122 |           3167 |   +45 |
- |   Covered           |           2107 |           2048 |   -59 |
- | Code to Test Ratio  |          1:0.5 |          1:0.5 |  -0.0 |
  |   Code              |           8180 |           8250 |   +70 |
  |   Test              |           3863 |           3863 |     0 |
+ | Test Execution Time |          4m18s |           4m2s |  -16s |

Code coverage of files in pull request scope (63.5% → 61.6%)

Files	Coverage	+/-
config/config.go	65.9%	0.0%
config/yaml.go	12.8%	-28.8%
output/md/md.go	80.3%	+3.3%
schema/schema.go	29.0%	-2.9%

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Reported by octocov