update issue templates

Author: thornjad

.github/ISSUE_TEMPLATE

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+---
+name: Bug report
+about: Create a report to help us improve
+---
+
+<!-- Describe the issue briefly here. -->
+
+#### Environment Versions
+
+1. OS Type
+1. Node version: `$ node --version`
+1. http-server version: `$ http-server --version`
+
+#### Steps to reproduce
+
+<!-- Include the actual command -->
+
+1. ...
+2. ...
+3. ...
+
+#### Expected result
+
+...
+
+#### Actual result
+
+<!-- Include full output and/or stack trace -->
+
+...
+
+#### Other information
+
+<!-- Include related issues, suggestions for a fix or further debug information, etc. -->

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+---
+
+#### What's the problem this feature will solve?
+
+<!-- What are you trying to do, that you are unable to achieve with http-server as it currently stands? -->
+
+#### Describe the solution you'd like
+
+<!-- A clear and concise description of what you want to happen. -->
+
+<!-- Provide examples of real-world use cases that this would enable and how it solves the problem described above. -->
+
+#### Alternative Solutions
+
+<!-- Have you tried to workaround the problem using http-server or other tools? Or a different approach to solving this issue? Please elaborate here. -->
+
+#### Additional context
+
+<!-- Add any other context, links, etc. about the feature here. -->

.github/ISSUE_TEMPLATE/feature-request.md

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+<!--- Describe the changes here. --->
+
+##### Relevant issues
+
+<!--
+    Link to the issue(s) this pull request fixes here, if applicable: "Fixes #xxx" or "Resolves #xxx"
+    
+    If your PR fixes multiple issues, list them individually like "Fixes #xx1, fixes #xx2, fixes #xx3". This is a quirk of how GitHub links issues.
+-->
+
+##### Contributor checklist
+
+- [ ] Provide tests for the changes (unless documentation-only)
+- [ ] Documented any new features, CLI switches, etc. (if applicable)
+    - [ ] Server `--help` output
+    - [ ] README.md
+    - [ ] doc/http-server.1 (use the same format as other entries)
+- [ ] The pull request is being made against the `master` branch
+
+##### Maintainer checklist
+
+- [ ] Assign a version triage tag
+- [ ] Approve tests if applicable