Add follow-up section to PR template (#12901)

* Add follow-up section to PR template

fixed #12900

Signed-off-by: Jonas Helming <jhelming@eclipsesource.com>

.github/PULL_REQUEST_TEMPLATE.md

@@ -10,11 +10,17 @@ vulnerabilities.
 -->
 
 #### What it does
+
 <!-- Include relevant issues and describe how they are addressed. -->
 
 #### How to test
+
 <!-- Explain how a reviewer can reproduce a bug, test new functionality or verify performance improvements. -->
 
+#### Follow-ups
+
+<!-- Please list potential follow-up work, including known issues, possible future work, identified technical debt, and potentially introduced technical debt. If the PR introduces technical debt, specify the reason why this is acceptable. Please create tickets and link them here. Please use the label "technical debt" for new issues when it applies. -->
+
 #### Review checklist
 
 - [ ] As an author, I have thoroughly tested my changes and carefully followed [the review guidelines](https://github.com/theia-ide/theia/blob/master/doc/pull-requests.md#requesting-a-review)