* Update `PaginatedList`

Based on #605, `PaginatedList` could not process requests which return
pagination info in the response body. This update checks for `Link` headers
before checking the `meta` property in the response body.

* Update based on review

* Update pag list test with no header no next meta to run properly. Update changelog.

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Co-authored-by: Matthew Emond <me@ucf.edu>

* Begin adding coverage for New Quizzes (WIP)

* Finish New Quizzes endpoints

…nox/requests-mock#228

* Fix issue where Course.create_discussion_topic doesn't accept attachment files

* Add file tests for create_discussion_topic

* method delete group and course pages, update tests

* format fix

* Add Caitlin to authors. Add contribution to changelog. Formwatting tweaks.

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Co-authored-by: Matthew Emond <me@ucf.edu>

* Improve `PaginatedList` docstring

Include details for each parameter used in PaginatedList.

* Improve `PaginatedList` docstring

Include details for each parameter used in PaginatedList.

* Remove class docstring addition

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Co-authored-by: Matthew Emond <me@ucf.edu>

* Use `new_quizzes` and `graphql` keywords

Based on #612 and as an issue in #619, this adds the `new_quizzes` and
`graphql` keyword endpoints in the requester module. Methods which
specify these locations will have the correct URL supplied by the
library in the `_url` parameter for the requester.

Calls from the `canvas`, `course`, and `new_quizzes` modules have been
updated to use they keywords rather than a formatted URL string.

All tests passing.

* Better variable checks

Rearrange to check for `_url` first, then assign the request url more
explicitely.

* fix silly typos

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Co-authored-by: Matthew Emond <me@ucf.edu>

* Fixes #663 - New Quizzes URL not considered in paginated_list

* Flake8 error line length

* Reformatted by black