Astro Hack Week PR/Code Review tutorial content repository

This repository stores the example code for the AHW Pull Request/code review tutorial. Note that the actual content of the tutorial itself lives in the relevant year's repo (e.g. https://github.com/AstroHackWeek/AstroHackWeek2019 for 2019). This repo is for just the code content and its Pull Requests (because otherwise the main repo would be filled with pull requests).