docs(bug_report): add section requesting commit hash / release tag

* Useful to have this provided in a bug report, e.g.
  - saltstack-formulas/postfix-formula#100

Author: myii

.github/ISSUE_TEMPLATE/bug_report.md

@@ -36,6 +36,11 @@ Notes:
 
 
 
+#### Formula commit hash / release tag
+<!-- Please specify the formula's commit hash and/or release tag that you are using. -->
+
+
+
 #### Versions report
 <!-- Provided by running `salt --versions-report`. Please also mention any differences in master/minion versions. -->