Convert specs to RSpec 2.99.0 syntax with Transpec

This conversion is done by Transpec 2.2.4 with the following command:
    transpec

* 66 conversions
    from: obj.should_receive(:message)
      to: expect(obj).to receive(:message)

* 7 conversions
    from: be_true
      to: be_truthy

* 6 conversions
    from: Klass.any_instance.should_receive(:message)
      to: expect_any_instance_of(Klass).to receive(:message)

* 6 conversions
    from: expect { }.not_to raise_error(SpecificErrorClass)
      to: expect { }.not_to raise_error

* 3 conversions
    from: be_false
      to: be_falsey

* 2 conversions
    from: expect(collection).to have(n).items
      to: expect(collection.size).to eq(n)

* 2 conversions
    from: pending
      to: skip

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