Update to django v2

[alexisluque]

Closes #15.

[d33tah]

@alexisluque what's the status of this? Is it safe to use now?

[albertoperdomo]

@d33tah Won't be merged yet because the corresponding tutorial needs to be updated too, but the code in this branch is good to be used.

[albertoperdomo]

Waiting for updated tutorial to be deployed before merging.

[theonlyway]

I just attempted to use this sample to try and get familiar with Auth0. Step 3 didn't work for me. The callback URL doesn't get returned like it should apparently since it returns this:

Callback URL mismatch.
The URL "http://127.0.0.1:3000/complete/auth0?redirect_state=9A3R8RHYLruCdFXZHJXvf6OHAnru4oXy" is not in the list of allowed callback URLs.

Throwing that URL in to Auth0 works but I am assuming the query string probably shouldn't be there according to the documentation.