Modified the fetch_patch function to handle responses with more than one page of data

[katherine-hough]

Fixes Issue #19

Modified the fetch_patch function to handle responses with more than one page of data to ensure that all files modified in a PR are collected.

For more information on pagination in the GitHub REST API see:
https://docs.github.com/en/rest/using-the-rest-api/using-pagination-in-the-rest-api?apiVersion=2022-11-28

[hestonhoffman]

Thanks for the contribution! Definitely an oversight on my part! I was a little worried about handling potential rate limiting here, but I tested it on a couple of huge PRs and I think it's okay as long as users aren't using it in huge repos with lots of large PRs. I can always come back and handle that later if it becomes an issue.

I'm going to go ahead and merge this in. I'll come back later and cut a release.

[katherine-hough]

I think that the number of API requests can be reduced slightly for large PRs by increasing the number of items per page (https://docs.github.com/en/rest/using-the-rest-api/using-pagination-in-the-rest-api?apiVersion=2022-11-28#changing-the-number-of-items-per-page)?