Update ISSUE_TEMPLATE.md

* Add a few more instructions for new users
* Clearly indicate that filling out the template is required
* Add GFM requirement for all posted code
* Add a blank list for the steps to reproduce
* Swap the order of the actual and expected behavior blocks

.github/ISSUE_TEMPLATE.md

@@ -1,16 +1,27 @@
+You **MUST** use this template when reporting issues. Please make sure you follow the checklist and fill in all of the information sections below.
+
+----------------
+
 All versions of django-smart-selects prior to version 1.2.8 are vulnerable to an XSS attack as detailed in [issue 171](https://github.com/digi604/django-smart-selects/issues/171#issuecomment-276774103). As a result, all previous versions have been removed from PyPI to prevent users from installing insecure versions. All users are urged to upgrade as soon as possible.
 
 ## Checklist
 
-- [ ] This issue is not about installing previous versions of django-smart-selects older than 1.2.8. I understand that previous versions are insecure.
+<sup><sup>Put an `x` in the bracket when you have completed each task, like this: `[x]`</sup></sup>
+
+- [ ] This issue is not about installing previous versions of django-smart-selects older than 1.2.8. I understand that previous versions are insecure and will not receive any support whatsoever.
 - [ ] I have verified that that issue exists against the `master` branch of django-smart-selects.
 - [ ] I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
-- [ ] I have debugged the issue to the smart_selects app.
+- [ ] I have debugged the issue to the `smart_selects` app.
 - [ ] I have reduced the issue to the simplest possible case.
 - [ ] I have included all relevant sections of `models.py`, `forms.py`, and `views.py` with problems.
+- [ ] I have used [GitHub Flavored Markdown](https://help.github.com/articles/creating-and-highlighting-code-blocks/) to style all of my posted code.
 
 ## Steps to reproduce
 
-## Expected behavior
+1. 
+2. 
+3. 
 
 ## Actual behavior
+
+## Expected behavior