docs(github): remove checkboxes from issue template

.github/ISSUE_TEMPLATE.md

@@ -11,9 +11,9 @@ Before submitting an issue, please consult our docs -> https://stenciljs.com/
 
 **I'm submitting a:**
 <!-- (check one with "x") -->
-- [ ] bug report
-- [ ] feature request
-- [ ] support request => Please do not submit support requests here, use one of these channels: https://forum.ionicframework.com/ or https://stencil-worldwide.slack.com
+[ ] bug report
+[ ] feature request
+[ ] support request => Please do not submit support requests here, use one of these channels: https://forum.ionicframework.com/ or https://stencil-worldwide.slack.com
 
 **Current behavior:**
 <!-- Describe how the bug manifests. -->