Merge pull request #147 from bci-oss/add_checklist_item_copyright_header

Add checklist item copyright holder

.github/PULL_REQUEST_TEMPLATE.md

@@ -26,6 +26,7 @@ Closes #
 - [ ] all properties with an [simple type](https://openmanufacturingplatform.github.io/sds-documentation/bamm-specification/v1.0.0/datatypes.html) have an example value
 - [ ] metadata.json exists with status "release"
 - [ ] file RELEASE_NOTES.md exists and contains entries for proposed model changes 
+- [ ] all contributors to this model are mentioned in copyright header of model file
 
 ## MS3 Criteria
 (to be filled out by semantic modeling team before merge to main-branch)