• Minion::Backend::Pg now requires PostgreSQL 9.5.
  
• Added start event to Minion::Job.
  
• Added -R option to worker command.
  
• Reduced default missing_after value to 30 minutes.
  
• Reduced default remove_after value to 2 days.
  
• Improved Minion::Backend::Pg performance significantly with a new index and PostgreSQL 9.5 features.
  
• Improved Minion::Job to capture more exceptions.
  
• Improved worker command to support the QUIT signal.
  
• Improved worker command to repair in less regular intervals.