PR template

Author: andrewchi

.github/pull_request_template.md

@@ -11,7 +11,7 @@ Sample JSON or other output.
 
 ## Checklist
 
-<!-- Either complete or explain briefly why it is not applicable -->
+<!-- Either complete or explain below why it is not applicable -->
 
 - [ ] Configuration: command line option(s)
 - [ ] Configuration: config file option(s)