github: test new issue tempalte

My hope is that headers will make it easier to read
when people post issues.

.github/ISSUE_TEMPLATE.md

@@ -5,12 +5,12 @@ Read before posting:
 - Checkout How to troubleshoot metric query issues: https://community.grafana.com/t/how-to-troubleshoot-metric-query-issues/50
 
 Please include this information:
-- What Grafana version are you using?
+### What Grafana version are you using?
-- What datasource are you using?
+### What datasource are you using?
-- What OS are you running grafana on?
+### What OS are you running grafana on?
-- What did you do?
+### What did you do?
-- What was the expected result?
+### What was the expected result?
-- What happened instead?
+### What happened instead?
-- If related to metric query / data viz:
+### If related to metric query / data viz:
-  - Include raw network request & response: get by opening Chrome Dev Tools (F12, Ctrl+Shift+I on windows, Cmd+Opt+I on Mac), go the network tab.
+### Include raw network request & response: get by opening Chrome Dev Tools (F12, Ctrl+Shift+I on windows, Cmd+Opt+I on Mac), go the network tab.