Update PR template (#415)

### What problem does this PR solve?

Update PR template

### Type of change

- [x] Documentation Update

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

.github/pull_request_template.md

@@ -2,16 +2,11 @@
 
 _Briefly describe what this PR aims to solve. Include background context that will help reviewers understand the purpose of the PR._
 
-Issue link:#[Link the issue here]
-
 ### Type of change
 
 - [ ] Bug Fix (non-breaking change which fixes an issue)
 - [ ] New Feature (non-breaking change which adds functionality)
-- [ ] Breaking Change (fix or feature that could cause existing functionality not to work as expected)
 - [ ] Documentation Update
 - [ ] Refactoring
 - [ ] Performance Improvement
-- [ ] Test cases
-- [ ] Python SDK impacted, Need to update PyPI
 - [ ] Other (please describe):