Update ISSUE_TEMPLATE.md

Signed-off-by: Alex Ellis <[email protected]>

Author: alexellis

.github/ISSUE_TEMPLATE.md

@@ -7,6 +7,9 @@
 <!-- How is this affecting you? What task are you trying to accomplish? -->
 ## Why do you need this?
 
+## Who is this for?
+
+What company is this for? Are you listed in the [ADOPTERS.md](https://github.com/openfaas/faas/blob/master/ADOPTERS.md) file?
 
 <!--- Provide a general summary of the issue in the Title above -->
 ## Expected Behaviour