Update pull_request_template.md

Author: sampotts

.github/pull_request_template.md

@@ -1,8 +1,3 @@
 ### Link to related issue (if applicable)
 
 ### Summary of proposed changes
-
-### Checklist
-- [ ] Use `develop` as the base branch
-- [ ] Exclude the gulp build (`/dist` changes) from the PR
-- [ ] Test on [supported browsers](https://github.com/sampotts/plyr#browser-support)