Update issue templates

.github/ISSUE_TEMPLATE/Bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+Summary.
+
+## Expected Result
+
+What you expected.
+
+## Actual Result
+
+What happened instead.
+
+## Reproduction Steps
+
+```python
+import requests
+
+```
+
+## System Information
+
+    $ python -m requests.help
+
+```
+<paste here>
+```
+
+This command is only available on Requests v2.16.4 and greater. Otherwise,
+please provide some basic information about your system (Python version,
+operating system, &c).

.github/ISSUE_TEMPLATE/Custom.md

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+---
+name: Request for Help
+about: Guidance on using Requests.
+
+---
+
+Please refer to our [StackOverflow tag](https://stackoverflow.com/questions/tagged/python-requests) for guidance.

.github/ISSUE_TEMPLATE/Feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+Requests is not accepting feature requests at this time.