Update pull_request_template.md
Update pull_request_template.md

Remove spaces between [] so users don't forget to remove/replace it ;)
PoUpA/Worldopole,brusselopole/Worldopole,brusselopole/Worldopole,brusselopole/Worldopole,PoUpA/Worldopole,PoUpA/Worldopole,PoUpA/Worldopole,brusselopole/Worldopole