meta: update pull request template (#4732)

* meta: update pull request template

* Update pull_request_template.md

* Update pull_request_template.md

Author: dingsdax

.github/pull_request_template.md

@@ -6,13 +6,18 @@
 <!--- Why is this change required? What problem does it solve? -->
 <!--- If it fixes an open issue, please link to the issue here. -->
 
+<!--
+* resolves: #1234
+* resolves: LIN-1234
+-->
 
 ## :green_heart: How did you test it?
 
 
 ## :pencil: Checklist
 <!--- Put an `x` in the boxes that apply -->
 
+- [ ] I added GH Issue ID _&_ Linear ID
 - [ ] I added tests to verify the changes.
 - [ ] No new PII added or SDK only sends newly added PII if `sendDefaultPII` is enabled.
 - [ ] I updated the docs if needed.