Update rspec
Convert specs to RSpec 2.99.2 syntax with Transpec

This conversion is done by Transpec 2.3.7 with the following command:
    transpec

* 133 conversions
    from: it { should ... }
      to: it { is_expected.to ... }

* 32 conversions
    from: it { should_not ... }
      to: it { is_expected.not_to ... }

* 28 conversions
    from: describe 'some model' { }
      to: describe 'some model', :type => :model { }

* 20 conversions
    from: pending 'is an example' { }
      to: skip 'is an example' { }

* 10 conversions
    from: obj.should
      to: expect(obj).to

* 8 conversions
    from: describe 'some request' { }
      to: describe 'some request', :type => :request { }

* 8 conversions
    from: its(:attr) { }
      to: describe '#attr' do subject { super().attr }; it { } end

* 2 conversions
    from: be_false
      to: be_falsey

* 1 conversion
    from: be_true
      to: be_truthy

* 1 conversion
    from: describe 'some controller' { }
      to: describe 'some controller', :type => :controller { }

* 1 conversion
    from: describe 'some helper' { }
      to: describe 'some helper', :type => :helper { }

* 1 conversion
    from: describe 'some mailer' { }
      to: describe 'some mailer', :type => :mailer { }

For more details: https://github.com/yujinakayama/transpec#supported-conversions