docs(pull_request_template): add merging guidelines (#55)

rubinovitz · web-flow · commit 3e69c05a497c · 2021-01-14T09:30:49.000-08:00
diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
@@ -16,3 +16,10 @@
 ### Typescript
 - [ ] added or edited relevant Typescript type declarations
 - [ ] no type declaration updates needed
+
+## Merging
+For maintainers.
+
+To merge, select "Squash and Merge". Then:
+  1. Make sure the top commit message follows [Angular Git Commit Guidelines](https://github.com/angular/angular.js/blob/master/DEVELOPERS.md#-git-commit-guidelines),
+  2. Delete all other commit messages in the description, but keep any lines designating [co-authors](https://docs.github.com/en/free-pro-team@latest/github/committing-changes-to-your-project/creating-a-commit-with-multiple-authors) so contributors will retain credit for their contributions.
