Convert specs to RSpec 2.99.1 syntax with Transpec

This conversion is done by Transpec 2.3.6 with the following command:
    transpec

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

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

* 6 conversions
    from: =~ /pattern/
      to: match(/pattern/)

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