Merge pull request reugn#20 from reugn/develop

v0.3.8

Merge pull request reugn#19 from reugn/develop

v0.3.7

Merge pull request reugn#16 from reugn/develop

v0.3.6

fix initial asterisk step value (reugn#14)

Merge pull request reugn#12 from reugn/develop

Fix bug in day-of-week cron expression (reugn#11)

Merge pull request reugn#10 from reugn/develop

v0.3.3

improve cyclomatic complexities; refactor error handling

Merge pull request reugn#7 from reugn/develop

v0.3.1

fix import

Merge pull request reugn#3 from reugn/develop

Develop