Challenges/PULL_REQUEST_TEMPLATE.md

Thanks for submitting a pull request. Do not use this form for bug reports! Your submission must meet the minimum requirements of a contribution, i.e., add code, refactor code or fix code. It takes time and effort to review submissions, so please do not waste our time. Note: formatting/spacing-only submissions will be rejected! For submissions, we want you to use spaces, not tabs (4 spaces) - thank you.