3.0.0

• Use default arguments for NullStatus initialization [briansharon#111]
• Fix at and in chainable methods [wpolicarpo#109]
• Rely on all of RSpec in development [packrat386#101]
• Pass exception to within_sidekiq_retries_exhausted_block [packrat386#100]
• Add support for testing scheduled jobs [wpolicarpo#81]
• only depend on rspec-core [urkle#96]
• Add support for Sidekiq Enterprise [Geesu#82]
• Fix clash with rspec-rails [pavel-jurasek-bcgdv-com#95]