chore(build): add npm pack --dry-run to visually identify pack issues

Author: STRML

Makefile

@@ -85,4 +85,5 @@ define release
 git add package.json CHANGELOG.md $(MIN) $(MIN_MAP) && \
 git commit -m "release $$NEXT_VERSION" && \
 git tag "$$NEXT_VERSION" -m "release $$NEXT_VERSION"
+npm pack --dry-run
 endef