feat(options): support duration string for sleep/delay options

chore: bump up to v0.4.2

chore: bump up to v0.4.1

chore: update goreleaser

Merge pull request mingrammer#26 from glickel/patch-1

Fix apache error log format

Version up to v0.3.1

Version up to v0.3.0

Version up to v0.2.5

Add 'delay' option

Version up to v0.2.3