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: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Puma config:**
+
+Please copy-paste your Puma config or your command line options here.
+
+**To Reproduce**
+Please add reproduction steps here.
+
+Your issue will be solved very quickly if you can reproduce it with a "hello world" rack application. To do this, copy this into a file called `hello.ru`:
+
+```
+run lambda { |env| [200, {"Content-Type" => "text/plain"}, ["Hello World"]] }
+```
+
+Run it with:
+
+```
+bundle exec puma -C <where_your_config_is> hello.ru
+```
+
+If you cannot reproduce with a hello world application or other simple application, we will have a lot more difficulty helping you fix your issue, because it may be application-specific and not a bug in Puma at all. 
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. Mac, Linux]
+ - Puma Version [e.g. 4.1.1]

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+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.