Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve Yew
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Problem**
+<!-- A clear and concise description of what the bug is. -->
+
+**Steps To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment:**
+ - Yew version [e.g. v0.10, `master`]
+ - Rust version [e.g. 1.40.0]
+ - `stdweb` / `web-sys` version [e.g. web-sys v0.3.33]
+ - OS: [e.g. macos]
+ - Browser [e.g. chrome, safari]
+ - Browser version [e.g. 22]
+
+**Questionnaire**
+<!-- Developing Yew is a community effort! -->
+<!-- If you feel up to the challenge, please check one of the boxes below: -->
+- [ ] I'm interested in fixing this myself but don't know where to start
+- [ ] I would like to fix and I have a solution
+- [ ] I don't have time to fix this right now, but maybe later

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: feature
+assignees: ''
+
+---
+
+<!-- Please only include one feature request per issue, thank you! -->
+
+**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.