Write a converter in JavaScript, which takes an integer end returns the roman numeral representation in a string.

Process:

• Fork the repository
• clone it to your computer
• Run: npm install in the project directory
• The function is defined in the index.js file
• Run: npm test for running unit tests
• The unit tests are pre-written in the test directory, but they are commented out.

Happy coding, and don't forget your semicolons!