Use context.AfterFunc instead of go func()

[k1LoW]

SSIA.

[github-actions]

Code Metrics Report

	main (d09ccd3)	#52 (9850d2d)	+/-
Coverage	91.4%	91.3%	-0.1%
Code to Test Ratio	1:3.6	1:3.7	+0.0
Test Execution Time	9s	10s	+1s

Details

  |                     | main (d09ccd3) | #52 (9850d2d) |  +/-  |
  |---------------------|----------------|---------------|-------|
- | Coverage            |          91.4% |         91.3% | -0.1% |
  |   Files             |              1 |             1 |     0 |
  |   Lines             |            105 |           104 |    -1 |
- |   Covered           |             96 |            95 |    -1 |
+ | Code to Test Ratio  |          1:3.6 |         1:3.7 |  +0.0 |
  |   Code              |            210 |           209 |    -1 |
+ |   Test              |            768 |           783 |   +15 |
- | Test Execution Time |             9s |           10s |   +1s |

Code coverage of files in pull request scope (91.4% → 91.3%)

Files	Coverage	+/-
donegroup.go	91.3%	-0.1%

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Reported by octocov