Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Description**
+A clear and concise description of what the bug is. 
+
+**To Reproduce**
+A minimal code example to reproduce the bug. If any extra data (e.g. skeletons) are required, please attach the file(s) to the issue.
+
+```Python
+import navis 
+...
+```
+
+If the code generates an error please make sure to share the _entire_ traceback.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Your system**
+- NAVis version: [e.g. 1.5.0]
+- Python version: [e.g. Python 3.10]
+- Operating System: [e.g. OSX, Windows or Linux]
+
+**Additional context**
+Add any other context about the problem here.