Exclude bots from contributors

[hendrikebbers]

Currently bots are part of contributors

[AnushkaGupta27]

Hi, I would like to work on this issue,
My plan is to update the GitHubClient.java to exclude bot accounts more reliably by filtering out contributors with "type": "Bot" and also usernames ending with [bot].

[ayesigaisaac]

hey i would like to contribute to this issue