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: bug
+assignees: neithere
+
+---
+
+### Summary
+A clear and concise description of what the bug is.
+
+### To Reproduce
+Example script:
+```
+import argh
+
+SOME CODE
+```
+
+Example command line interaction:
+```
+$ my-script.py ...
+SOME OUTPUT
+```
+
+### Expected behavior
+
+A clear and concise description of what you expected to happen.
+
+
+### Environment
+
+ - OS: [e.g. Linux]
+ - Python version: ...
+ - Argh version: ...
+
+### Additional context
+
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: neithere
+
+---
+
+### Is your feature request related to a problem?
+
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+### Describe the solution you'd like
+
+A clear and concise description of what you want to happen.
+
+### Describe alternatives you've considered
+
+A clear and concise description of any alternative solutions or features you've considered.
+
+### Additional context
+
+Add any other context, links or screenshots about the feature request here.