Update PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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 # Pull request checklist
 
 - [ ] The PR has a proper title. Use [Semantic Commit Messages](https://seesparkbox.com/foundry/semantic_commit_messages). (No more branch-name title please)
-- [ ] Make sure you are requesting the right branch: `dev`.
 - [ ] Make sure this is ready to be merged into the relevant branch. Please don't create a PR and let it hang for a few days.
-- [ ] Ensure all tests are passing.
-- [ ] Ensure linting is passing.
+- [ ] Ensure you can run the codes you submitted succesfully. These submissions will be prioritized for review:
+
+    Introduce improvements in program execution speed;
+
+    Introduce improvements in synthesis quality;
+
+    Fix existing bugs reported by user feedback (or you met);
+
+    Introduce more convenient user operations.
 
 # PR type
 
-- Bug fix / new feature / chore
+- Bug fix / new feature / synthesis quality improvement / program execution speed improvement
 
 # Description