Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report something not working as expected.
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+First, please check that you're running the [latest version of twitch-dl](https://github.com/ihabunek/twitch-dl/releases/latest).
+
+**Environment**
+
+Run `twitch-dl env` and paste the result below.
+
+```
+paste here
+```
+
+**Describe the bug**
+
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+
+Steps to reproduce the behavior.

.github/ISSUE_TEMPLATE/discussion.md

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+---
+name: Discussion
+about: Any other issue.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new feature.
+title: ''
+labels: feature request
+assignees: ''
+
+---
+
+