Change issue template to say OS version

Summary:
the title says its all.

(Note: this ignores all push blocking failures!)

Reviewed By: mhorowitz

Differential Revision: D25857706

fbshipit-source-id: 61ac752b1d927dbf0f2806f476dd1a655261d0e5

.github/ISSUE_TEMPLATE/01_bug_report.md

@@ -29,7 +29,7 @@ labels:
 
 Hermes version:
 React Native version (if any):
-Android version (if any):
+OS version (if any):
 Platform (most likely one of arm64-v8a, armeabi-v7a, x86, x86_64):
 
 ## Steps To Reproduce