Mandates referencing issue in PR (#1717)

* Mandates referencing issue in PR

* Update CONTRIBUTING.md

* Update pull_request_template.md

* Update pull_request_template.md

* Update pull_request_template.md

* Update CONTRIBUTING.md

Co-authored-by: John Law <johnlaw.po@gmail.com>
Co-authored-by: Christian Clauss <cclauss@me.com>

onlinejudge95 committed 6y ago

5c7d7782b0fd386b3fe205d34d73c24c241b3553

Parent: 63a1c41

Committed by Christian Clauss <cclauss@me.com> on 1/27/2020, 8:54:57 PM