Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help improve catsim!
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Provide a snippet that reproduces the bug. Consider hard-coding item parameters, thetas, response vectors etc. The snippet can be a Python file, or code pasted directly in the comment, or even a Colab notebook. See [this example](https://colab.research.google.com/drive/1vhH_X4vUdKfHvTx3LqVrRs-shAeHPsOF) from a previous issue.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Software versions:**
+ - Python: [e.g. 3.10.1]
+ - catsim: [e.g. 0.17.3]
+
+**Additional context**
+Add any other context about the problem here.