Update pull_request_template.md

Author: oameye

.github/pull_request_template.md

@@ -2,11 +2,9 @@
 
 Thank you for contributing to `QuestBase.jl`! Please make sure you have finished the following tasks before finishing the PR.
 
-<!-- - [ ] Any code changes were done in a way that does not break public API. -->
 - [ ] Appropriate tests were added and tested locally by running: `make test`.
 - [ ] Any code changes should be `julia` formatted by running: `make format`.
 - [ ] All documents (in `docs/` folder) related to code changes were updated and able to build locally by running: `make docs`.
-<!-- - [ ] (If necessary) the `CHANGELOG.md` should be updated (regarding to the code changes) and built by running: `make changelog`. -->
 
 Request for a review after you have completed all the tasks. If you have not finished them all, you can also open a [Draft Pull Request](https://github.blog/2019-02-14-introducing-draft-pull-requests/) to let the others know this on-going work.