Update pull_request_template.md

fixed grammar

.github/pull_request_template.md

@@ -1,7 +1,7 @@
 Do you follow the guidelines?
 
 - [ ] I have tested my changes
-- [ ] There is no breaking changes
+- [ ] There are no breaking changes
 - [ ] I really tested my changes and there is no regression
 - [ ] Ideally, my commit messages follow the [Conventional Commits specification](https://www.conventionalcommits.org/)
 - [ ] I read this document: https://miniflux.app/faq.html#pull-request