Retrospective timeline

[AlexSim93]

Pull Request

Description

Retrospective timelines is created as a comment.

Type of Change

• [ ] Bug fix
• [x] New feature
• [ ] Documentation update
• [ ] Other (please specify)

How Has This Been Tested?

I have tried to create report for 1 month. In this case comment hasn't been created. In case it has more than 1 month comment has been created and references has been added successfully

Checklist:

• [x] I have read the CONTRIBUTING document.
• [x] My code follows the code style of this project.
• [ ] I have added tests to cover my changes.
• [x] My changes generate no new warnings.
• [x] I have updated the documentation accordingly.