Remove deprecated code

[k1LoW]

SSIA.

[github-actions]

BenchmarkManyRunbooks-4

	main (-)	#790 (35d5b78)	+/-
Number of iterations	1	1	0
Nanoseconds per iteration	3,690,014,685 ns/op	3,361,205,964 ns/op	-328,808,721 ns/op
Bytes allocated per iteration	1,545,014,720 B/op	1,543,477,960 B/op	-1,536,760 B/op
Allocs per iteration	17,130,538 allocs/op	17,124,300 allocs/op	-6,238 allocs/op

Metadata

	main (-)	#790 (35d5b78)
goos	linux	linux
goarch	amd64	amd64
pkg	github.com/k1LoW/runn	github.com/k1LoW/runn
cpu	AMD EPYC 7763 64-Core Processor	AMD EPYC 7763 64-Core Processor

BenchmarkSingleRunbook-4

	main (-)	#790 (35d5b78)	+/-
Number of iterations	20	21	1
Nanoseconds per iteration	56,099,701 ns/op	55,243,415 ns/op	-856,286 ns/op
Bytes allocated per iteration	57,393,597 B/op	57,385,464 B/op	-8,133 B/op
Allocs per iteration	163,098 allocs/op	163,050 allocs/op	-48 allocs/op

Metadata

	main (-)	#790 (35d5b78)
goos	linux	linux
goarch	amd64	amd64
pkg	github.com/k1LoW/runn	github.com/k1LoW/runn
cpu	AMD EPYC 7763 64-Core Processor	AMD EPYC 7763 64-Core Processor

---

Reported by octocov

[github-actions]

Code Metrics Report

	main (8735ea0)	#790 (35d5b78)	+/-
Coverage	70.2%	70.4%	+0.1%
Code to Test Ratio	1:0.7	1:0.7	+0.0
Test Execution Time	3m22s	2m40s	-42s

Details

  |                     | main (8735ea0) | #790 (35d5b78) |  +/-  |
  |---------------------|----------------|----------------|-------|
+ | Coverage            |          70.2% |          70.4% | +0.1% |
  |   Files             |             50 |             49 |    -1 |
  |   Lines             |           9369 |           9353 |   -16 |
  |   Covered           |           6581 |           6581 |     0 |
+ | Code to Test Ratio  |          1:0.7 |          1:0.7 |  +0.0 |
  |   Code              |          12897 |          12874 |   -23 |
- |   Test              |           9544 |           9542 |    -2 |
+ | Test Execution Time |          3m22s |          2m40s |  -42s |

Code coverage of files in pull request scope (62.2% → 63.3%)

Files	Coverage	+/-
builtin/json.go	0.0%	0.0%
option.go	63.3%	+0.7%

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Reported by octocov