Console rendering missing sections since 2.1.0-beta.7

[TheFreaky]

The following sections are absent in the console output:

• What's New
• What's Deleted
• What's Deprecated

The "What's Changed" section formatting is broken.
The "Result" title is absent.

This issue was introduced in #544.

Specification:
petstore_v2_1.yaml
petstore_v2_2.yaml

Diff example:
Version: 2.1.0-beta.6

==========================================================================
==                            API CHANGE LOG                            ==
==========================================================================
                             Swagger Petstore                             
--------------------------------------------------------------------------
--                              What's New                              --
--------------------------------------------------------------------------
- GET    /pet/{petId}

--------------------------------------------------------------------------
--                            What's Deleted                            --
--------------------------------------------------------------------------
- POST   /pet/{petId}

--------------------------------------------------------------------------
--                          What's Deprecated                           --
--------------------------------------------------------------------------
- GET    /user/logout

--------------------------------------------------------------------------
--                            What's Changed                            --
--------------------------------------------------------------------------
- DELETE /pet/{petId}
  Parameter:
    - Add newHeaderParam in header
...

--------------------------------------------------------------------------
--                                Result                                --
--------------------------------------------------------------------------
                 API changes broke backward compatibility                 
--------------------------------------------------------------------------

Version: 2.1.0-beta.7

==========================================================================
==                            API CHANGE LOG                            ==
==========================================================================
                             Swagger Petstore                             
--------------------------------------------------------------------------
--                            What's Changed                            --
--------------------------------------------------------------------------
  Parameter:
    - Add newHeaderParam in header
- DELETE /pet/{petId}
...

                 API changes broke backward compatibility                 
--------------------------------------------------------------------------