Update PULL_REQUEST_TEMPLATE.md

See https://github.com/louislam/uptime-kuma/pull/785#issuecomment-950521657

.github/PULL_REQUEST_TEMPLATE.md

@@ -4,12 +4,14 @@ Fixes #(issue)
 
 ## Type of change
 
-- [ ] Bug fix (non-breaking change which fixes an issue)
+Please delete options that are not relevant.
-- [ ] User Interface
+
-- [ ] New feature (non-breaking change which adds functionality)
+- Bug fix (non-breaking change which fixes an issue)
-- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- User Interface
-- [ ] Translation update
+- New feature (non-breaking change which adds functionality)
-- [ ] This change requires a documentation update
+- Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- Translation update
+- This change requires a documentation update
 
 ## Checklist
 
@@ -18,6 +20,6 @@ Fixes #(issue)
 - [ ] I have performed a self-review of my own code and test it
 - [ ] I have commented my code, particularly in hard-to-understand areas
 - [ ] My changes generate no new warnings
-- [ ] My code needed automated testing. I have added them
+- [ ] My code needed automated testing. I have added them (this is optional task)
 
 ## Screenshots (if any)