Add strict mode option

[kyoshidajp]

No description provided.

[github-actions]

Code Metrics Report

	main (99f9cf3)	#32 (3561944)	+/-
Coverage	57.5%	57.6%	+0.1%
Code to Test Ratio	1:0.7	1:0.7	-0.0
Test Execution Time	23s	15s	-8s

Details

  |                     | main (99f9cf3) | #32 (3561944) |  +/-  |
  |---------------------|----------------|---------------|-------|
+ | Coverage            |          57.5% |         57.6% | +0.1% |
  |   Files             |             16 |            16 |     0 |
  |   Lines             |            362 |           363 |    +1 |
+ |   Covered           |            208 |           209 |    +1 |
- | Code to Test Ratio  |          1:0.7 |         1:0.7 |  -0.0 |
  |   Code              |            993 |           995 |    +2 |
  |   Test              |            656 |           656 |     0 |
+ | Test Execution Time |            23s |           15s |   -8s |

Code coverage of files in pull request scope (54.7% → 55.0%)

Files	Coverage	+/-
cmd/diagnose.go	55.0%	+0.4%

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Reported by octocov