Update PULL_REQUEST_TEMPLATE.md

Author: BrianThomasRoss

.github/PULL_REQUEST_TEMPLATE.md

@@ -7,6 +7,7 @@
 - [ ] Documentation  revised /  included
 - [ ] Unit tests included
 - [ ] Issues referenced
+- [ ] Doesn't create new bugs / issues
 ---
 ### References
 <!-- Include the issues or other pull requests that this pull requests addresses, make sure to use keywords e.g. Fixes #123, #125. Also see #117 so that the issues close automatically as your PR is merged https://github.blog/2013-05-14-closing-issues-via-pull-requests/ -->