Use native Elixir DateTime, Date

[johnwunder]

Is there any reason MarcoPolo doesn't use the native Elixir DateTime and Date types? Was it just done before they were added?

Would seem to be more convenient, and I'd be happy to PR to fix, just don't want to spend time on it if there was some other reason not to.

[simonewebdesign]

Was it just done before they were added?

Exactly. I think you can go for a PR if you want. :)

[whatyouhide]

A PR would be fantastic @johnwunder :D Feel free to ping if you need any help along the way!

[johnwunder]

Cool, I'll give it a shot (didn't forget about this, just other job stuff got in the way).

[whatyouhide]

Ping @johnwunder? :)

[johnwunder]

Sorry there's a pull request #48 which is failing now because the CI tests against an Elixir version before they were added. You could in theory write conditional logic to use either the native types (if available) or the custom types but since I'm just using the newer Elixir version I couldn't justify spending the time to do that.