Ignore .ruby-version
Convert specs to RSpec 3.1.7 syntax with Transpec

This conversion is done by Transpec 3.0.3 with the following command:
    transpec -f

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

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

* 17 conversions
    from: obj.stub(:message)
      to: allow(obj).to receive(:message)

* 16 conversions
    from: == expected
      to: eq(expected)

* 4 conversions
    from: obj.should_not
      to: expect(obj).not_to

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