Update PULL_REQUEST_TEMPLATE.md (codebuddies#362) close codebuddies#357

add 'Fixes #' to PR template to close related issues automatically

Author: sharynneazhar

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,4 +1,6 @@
-Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request. If it fixes a bug or resolves a feature request, be sure to link to that issue.
+Fixes #\<issue number\>.
+
+Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request. If it fixes a bug or resolves a feature request, be sure to link to that issue above.
 
 Note that we are unlikely to accept pull requests that add features without prior discussion. The best way to propose a feature is to open an issue first and discuss your ideas there before implementing them.