Code cleanup

[remcodejongh]

Hi there!

It is my intention to start contributing on some open source projects, but since I've not done this before and stumbled upon yours I hoped I could help you a bit 😄.

I would like to do some code cleanup and add some unit tests for your controller. I first want to do the cleanup and create a PR for that.

The cleanup is mainly about moving the MakeSpringPrettyPrintJSON to a different package, since it's no controller. I'd also like to create a separate controller for the /hello call which would mean that we can use a @RequestMapping("pledges") to clean that part a bit up as well.

Let me know!

[MrRutledge]

Hi there!

Sounds good, go for it, I appreaciate all the help I can get.