Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us fix your problem
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--
+
+Thanks for submitting an issue!
+
+-->
+
+Here's a quick checklist in what to include:
+
+- [ ] Include a detailed description of the bug. Describe what you were trying to get done. Tell us what happened, what went wrong, and what you expected to happen.
+- [ ] Output of `intake_esgf.__version__`
+- [ ] Minimal, self-contained copy-pastable example that generates the issue if possible. Please be concise with code posted. See guidelines below on how to provide a good bug report:
+
+  - [Minimal Complete Verifiable Examples](https://stackoverflow.com/help/mcve)
+  - [Craft Minimal Bug Reports](http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports)
+
+Bug reports that follow these guidelines are easier to diagnose, and so are often handled much more quickly.

.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.