Fixed convertDegreesToRadians

[fionn-mac]

Closes #theRelatedIssueNumber

• [] Running yarn lint does not trigger any linter errors
• [] The test of the method you have fixed is passing
• [] You have written a new skeleton method for someone else to work on!
• [] You have written tests to accompany your skeleton method

[fionn-mac]

Oops! Sorry, missed that part. I've added it now. Is it fine?

[ktilcu]

@fionn-mac Thanks for the contribution! It would be really helpful if you could create an issue for your new method. Happy Hacktobering!