Tweak ISSUE_TEMPLATE

.github/ISSUE_TEMPLATE.md

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+<!-- This is a bug report template. By following the instructions below and
+filling out the sections with your information, you will help the us to get all
+the necessary data to fix your issue.
+
+You can also preview your report before submitting it. You may remove sections
+that aren't relevant to your particular case.
+
+Text between <!-- and --​> marks will be invisible in the report.
+-->
+
+### Description
+
+Describe here the problem that you are experiencing, or the feature you are requesting.
+
+### Steps to reproduce
+
+- For bugs, list the steps
+- that reproduce the bug
+- using hyphens as bullet points
+
+Describe how what happens differs from what you expected.
+
+Include screenshots if possible: you can drag and drop images below.
+
+### Version information
+
+<!-- IMPORTANT: please answer the following questions, to help us narrow down the problem -->
+
+- **Platform**: web (in-browser) or desktop?
+- **Browser**: Chrome, Safari, Firefox? which version? <!-- n/a for desktop app -->
+- **OS**: Windows, macOS, Ubuntu, Arch Linux, etc?
+- **Version**: <!-- riot-web version from the user settings panel -->