Update PR template w/ CONTRIBUTOR/REVIEWER division

Author: interactivellama

docs/PULL_REQUEST_TEMPLATE.md

@@ -4,7 +4,8 @@ Fixes #
 
 ---
 
-### Pull Request Review checklist (do not remove)
+### CONTRIBUTOR checklist (do not remove)
+Please complete for every pull request
 
 * [ ] `npm run lint:fix` has been run and linting passes.
 * [ ] Mocha, Jest (Storyshots), and `components/component-docs.json` CI tests pass (`npm test`).
@@ -13,6 +14,15 @@ Fixes #
 * [ ] The Accessibility panel of each Storybook story has 0 violations (aXe). Open [http://localhost:9001/](http://localhost:9001/).
 * [ ] Review tests are passing in the browser. Open [http://localhost:8001/](http://localhost:8001/).
 * [ ] Review markup conforms to [SLDS](https://www.lightningdesignsystem.com/) by looking at [DOM snapshot strings](https://facebook.github.io/jest/docs/en/snapshot-testing.html).
+
+### REVIEWER checklist (do not remove)
+
+* [ ] TravisCI tests pass. This includes linting, Mocha, Jest, Storyshots, and `components/component-docs.json` tests.
+* [ ] Tests have been added for new props to prevent regressions in the future. See [readme](https://github.com/salesforce/design-system-react/blob/master/tests/README.md).
+* [ ] Review the appropriate Storybook stories. Open [http://localhost:9001/](http://localhost:9001/).
+* [ ] The Accessibility panel of each Storybook story has 0 violations (aXe). Open [http://localhost:9001/](http://localhost:9001/).
+* [ ] Review tests are passing in the browser. Open [http://localhost:8001/](http://localhost:8001/).
+* [ ] Review markup conforms to [SLDS](https://www.lightningdesignsystem.com/) by looking at [DOM snapshot strings](https://facebook.github.io/jest/docs/en/snapshot-testing.html).
 * [ ] Add year-first date and commit SHA to `last-slds-markup-review` in `package.json` and push.
 * [ ] Request a review of the deployed Heroku app by the Salesforce UX Accessibility Team.
 * [ ] Add year-first review date, and commit SHA, `last-accessibility-review`, to `package.json` and push.