Update issue templates

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug report
+about: Create a report to help us improve Ruffle!
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+If this is a problem in a specific game/animation, please include either a download link or instructions on where to find it.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+If it's a visual error, please include screenshots from both Flash and Ruffle.
+
+**Device (please complete the following information):**
+ - Ruffle application: [e.g. desktop, extension, selfhosted]
+ - OS: [e.g. windows, mac, linux]
+ - Browser [if applicable, e.g. chrome, safari, firefox]
+
+**Additional context**
+Add any other context about the problem here.