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: ''
+
+---
+
+Before submitting an issue, please make sure you fully read any potential error messages output and did some research on your own.
+
+### Subject of the issue
+Describe your issue here.
+
+### Your environment
+* Version of WPScan:
+* Version of Ruby:
+* Operating System (OS):
+
+### Steps to reproduce
+Tell us how to reproduce this issue.
+
+### Expected behavior
+Tell us what should happen.
+
+### Actual behavior
+Tell us what happens instead.
+
+### What have you already tried
+Tell us what you have already tried to do to fix the issue you are having.
+
+Things you have tried (where relevant):
+
+* Update WPScan to the latest version [ ]
+* Update Ruby to the latest version [ ]
+* Ensure you can reach the target site using cURL [ ]
+* Proxied WPScan through a HTTP proxy to view the raw traffic [ ]
+* Ensure you are using a supported Operating System (Linux and macOS) [ ]

.github/ISSUE_TEMPLATE/custom.md

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+---
+name: Custom issue template
+about: Describe this issue template's purpose here.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+

.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.