Convert specs to RSpec 2.99.2 syntax with Transpec

This conversion is done by Transpec 2.3.8 with the following command:
    transpec

* 23 conversions
    from: be_true
      to: be_truthy

* 7 conversions
    from: be_false
      to: be_falsey

* 7 conversions
    from: obj.should
      to: expect(obj).to

* 3 conversions
    from: == expected
      to: eq(expected)

* 1 conversion
    from: obj.should_not
      to: expect(obj).not_to

* 1 conversion
    from: pending { do_something_fail }
      to: pending; do_something_fail

For more details: https://github.com/yujinakayama/transpec#supported-conversions