update issue template

.github/issue_template.md

@@ -1,20 +1,37 @@
+# Important! Before filing an issue, please consider the following:
+
+    * Ensure your mu/mu4e setup is no older than the latest stable release (1.4.x).
+
+    * Disable any third-party mu4e extensions; this includes customizations like the one in "Doom" /
+      "Evil" etc.
+
+    * If a problem occurs with a certain (type of) message, attach an (anonymized) example of
+      such a message
+
+    * Please follow the below template
+
+    Thanks!
+
 ## Expected or desired behavior
 
-Please describe the behavior you expected / want
+Please describe the behavior you expect or want
 
 ## Actual behavior
 
 Please describe the behavior you are actually seeing.
 
-For bug-reports, if applicable, include error messages, emacs stack
+For bug-reports, if applicable, include error messages, emacs stack traces, example messages
-traces etc. Try to be as specific as possible - when do you see this
+etc. Try to be as specific as possible - when do you see this happening? Does it happen always?
-happening? Does it happen always?  Sometimes? How often?
+Sometimes? How often?
 
 ## Steps to reproduce
 
-For bug-reports, please describe in as much details as possible how
+For bug-reports, please describe in as much detail as possible how one can reproduce the problem.
-one can reproduce the problem*.
+
+If there's a problem with a specific (type of) message, please attach such a message to the report.
 
 ## Versions of mu, mu4e/emacs, operating system etc.
 
 ## Any other detail
+
+E.g. are you using the gnus-based message view?