Version 0.3.0

• Add beginning and end to :at regex to better validate the value #22
• Add descriptions for :queue_ahead and :tz options in README #23
• Add additional information about the scheduled_time passed to jobs #25
• Fix bug where optional job arguments raises exception #26

Breaking changes from v0.2.*:

By improving the regex pattern used to parse the :at time in #22, you may now get a SimpleScheduler::At::InvalidTime error when you previously would not see an error. This is preferred because an invalid time would possibly schedule your jobs at unwanted times rather than letting you know that the time couldn't be parsed accurately.