Update ISSUE_TEMPLATE.md

Author: paulbatum

ISSUE_TEMPLATE.md

@@ -8,6 +8,7 @@ Please provide a succinct description of the issue. Please make an effort to fil
 Please provide the following:
 
 - Timestamp:
+- Function App version (1.0 or 2.0-beta):
 - Function App name:
 - Function name(s) (as appropriate):
 - Invocation ID:
@@ -91,4 +92,4 @@ public static async Task<HttpResponseMessage> Run([HttpTrigger(AuthorizationLeve
 }
 ```
 </details>
--->
+-->