Append diff function

[k2tzumi]

T/O

[github-actions]

Code Metrics Report

	main (e6b7faa)	#186 (26bd712)	+/-
Coverage	78.1%	77.9%	-0.3%
Code to Test Ratio	1:0.8	1:0.8	-0.0

Details

  |                    | main (e6b7faa) | #186 (26bd712) |  +/-  |
  |--------------------|----------------|----------------|-------|
- | Coverage           |          78.1% |          77.9% | -0.3% |
  |   Files            |             24 |             25 |    +1 |
  |   Lines            |           2707 |           2715 |    +8 |
- |   Covered          |           2115 |           2114 |    -1 |
- | Code to Test Ratio |          1:0.8 |          1:0.8 |  -0.0 |
  |   Code             |           5232 |           5248 |   +16 |
  |   Test             |           4038 |           4038 |     0 |

Code coverage of files in pull request scope (71.1% → 70.3%)

Files	Coverage	+/-
builtin/compare.go	75.0%	-2.8%
builtin/diff.go	63.6%	+63.6%
option.go	70.7%	0.0%

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Reported by octocov