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: kind/triage
+assignees: ''
+
+---
+
+#### Problem Description
+A clear and concise description of what the bug is.
+
+#### Steps to reproduce the behavior:
+1. 
+2. 
+3. 
+
+#### System Information
+Paste the output of "mitmproxy --version" here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: kind/feature
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+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 or screenshots about the feature request here.