Feedback on week 3 project progress for greatnest

[nus-pe-script]

Progress observed

• A version tagged Level-1 is in the repo(:heavy_check_mark: well done!)

• A version tagged Level-2 is in the repo(:heavy_check_mark: well done!)

• A version tagged Level-3 is in the repo(:heavy_check_mark: well done!)

• A version tagged Level-4 is in the repo(:heavy_check_mark: well done!)

• A version tagged Level-5 is in the repo(:heavy_check_mark: well done!)

• A version tagged A-Classes is in the repo(:heavy_check_mark: well done!)

• A version tagged A-Inheritance is in the repo(:heavy_check_mark: well done!)

• A version tagged Level-7 is in the repo(:heavy_check_mark: well done!)

• A version tagged Level-8 is in the repo(:heavy_check_mark: well done!)

_{Note: the above observation was done by the CS2113-feedback-bot and covers changes up to 2019-08-30 00:00:00 only. If you think the above observation is incorrect, please let us know by replying in this thread. Please include links to relevant PRs/comments in your response.}