github: add reviewers to the PR template

0xc0170 · 0xc0170 · commit cd54ed9cd56e · 2018-12-19T09:34:43.000Z
Use @mention to request specific reviewers.
diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
@@ -24,3 +24,10 @@
     [ ] Test update
     [ ] Breaking change
 
+### Reviewers
+
+<!-- 
+    Optional
+    Request additional reviewers via @username
+-->
+
