Update ISSUE_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

@@ -3,6 +3,7 @@ Thanks so much for filing an issue or feature request! Please fill out the follo
 * react-native-code-push version:
 * react-native version:
 * iOS/Android version:
+* Does this reproduce on a debug build or release build?
 * Does this reproduce on a simulator, or only on a physical device?
 * Repro steps and/or stack trace: