Update issue templates

.github/ISSUE_TEMPLATE/defect-report.md

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+---
+name: Defect report
+about: Create a report to help us improve
+
+---
+
+**Describe the problem**
+A clear and concise description of what the problem is.
+
+**Versions**
+Which PhantomJS version? Tip: run `phantomjs --version`
+Which OS: Linux, Windows, macOS?
+
+**Steps to Reproduce**
+1.
+2.
+3.
+
+**Actual behavior**
+What you observed.
+
+**Expected behavior**
+What you expected to happen instead.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**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.

.github/ISSUE_TEMPLATE/website-incompatibility.md

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+---
+name: Website incompatibility
+about: Report a website not working properly
+
+---
+
+**Summary**
+A concise description of the compatibility issue.
+
+**Test cases**
+Any URL or other web page that demonstrates the problem.
+
+**Initial analysis**
+If you did a preliminary troubleshooting, please share your finding.
+
+**Additional context**
+Add any other context or screenshots about the problem.