Error in PinEnvironment

[mattrowbum]

Hi Ross

It seems there is an error in PinEnvironment. If you call pin_get('/customers', True), the second argument is being passed on to the _pin_request method as the payload argument. This raises:

TypeError: Cannot mix str and non-str arguments

[rossp]

This feels like it's because of a stale codebase that assumes Python 2.7 or perhaps an older version of Django, but unfortunately I am not able to investigate and fix this issue at this time.

I am looking for a new maintainer for the django-pinpayments project and an issue like this would need to be one of the first things they review or accept a PR for.

Sorry if this delays your project @mattrowbum.