Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Is something not working properly? Report it here.
+title: "[BUG]"
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**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.
+
+**System info (please complete the following information):**
+ - OS: [e.g. Ubuntu]
+ - Docker daemon version: [Engine version in the output of `docker version`]
+ - Cup version: [Output of `cup --version`]
+
+**Additional context**
+Add any other info that you think may be useful here.