chore: update PR template

close #182

Author: xiejay97

.github/PULL_REQUEST_TEMPLATE.md

@@ -12,16 +12,14 @@ What kind of change does this PR introduce?
 
 <!-- Please check the one that applies to this PR using "x". -->
 
-```
-[ ] Bugfix
-[ ] Feature
-[ ] Code style update (formatting, local variables)
-[ ] Refactoring (no functional changes, no api changes)
-[ ] Build related changes
-[ ] CI related changes
-[ ] Documentation content changes
-[ ] Other... Please describe:
-```
+- [ ] Bugfix
+- [ ] Feature
+- [ ] Code style update (formatting, local variables)
+- [ ] Refactoring (no functional changes, no api changes)
+- [ ] Build related changes
+- [ ] CI related changes
+- [ ] Documentation content changes
+- [ ] Other... Please describe:
 
 ## What is the current behavior?
 
@@ -33,10 +31,8 @@ Issue Number: N/A
 
 ## Does this PR introduce a breaking change?
 
-```
-[ ] Yes
-[ ] No
-```
+- [ ] Yes
+- [ ] No
 
 <!-- If this PR contains a breaking change, please describe the impact and migration path for existing applications below. -->