Convert specs to RSpec 3.1.4 syntax with Transpec

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

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

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

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

* 4 conversions
    from: be_true
      to: be_truthy

* 1 conversion
    from: -> { }.should
      to: expect { }.to

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