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 what is not working as expected.
+
+If you are seeing an exception, include the full exceptions details (message and stack trace).
+
+```
+Exception message:
+Stack trace:
+```
+
+### Steps to reproduce
+Include a complete code listing (or project/solution) that we can run to reproduce the issue.
+
+Partial code listings, or multiple fragments of code, will slow down our response or cause us to push the issue back to you to provide code to reproduce the issue.
+
+```c#
+Console.WriteLine("Hello World!");
+```
+
+### Further technical details
+EntityFrameworkCore.Cacheable version: (found in project.csproj or packages.config)
+EF Core version: (found in project.csproj or packages.config)
+IDE: (e.g. Visual Studio 2017 15.4)

.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.