Update pull request template for tests-in-Azure infrastructure#644

Merged

CaseyCarter merged 3 commits intomicrosoft:masterfrom

BillyONeal:pr_template

Apr 1, 2020

Commits on Mar 27, 2020

Remove out of date parts of the pull request template, and put instructions to pull request submitters in a comment rather than duplicating them into each PR.
BillyONeal
committed

Commits on Mar 31, 2020

Re-add bullets 1 and 3.
BillyONeal
committed

Commits on Apr 1, 2020

Use "are derived" consistently, drop "such as Boost".
StephanTLavavej
committed