Add support for Pascal casing

[legopiraat]

Hi, with this pull request support for PascalCasing is added.
I ran into the case an external API was sending me PascalCased JSON and i was unable to parse it.
So I wrote this helper method to do this automatically.

Example:

{
 "Hello": "world"
}

case class Hello(hello: String)  // Will be parsed to Hello(world)

Somehow one test is failing and I have no idea why. Some help is appreciated there.
I did a local release and the code does work in my app.

[gannicottb]

Shame this PR stalled, I could use PascalCase support in my project.

[travisbrown]

I thought I had reviewed this, but apparently I didn't actually post it?

I think the test failure is because the test uses lowercase for single-character member names, while the transformation capitalizes them. I don't remember what the standard expectation is for single-character names in Pascal case, but would be happy to merge this if someone makes a case either way and fixes the test.