Update issue templates to new Github stardards

See https://blog.github.com/2018-05-02-issue-template-improvements/
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.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve OpenRefine
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Current Results**
+What results occured or were shown.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen or to show.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS, Windows, Linux]
+ - Browser [e.g. chrome, firefox, safari, NOTE: OpenRefine does not support IE but works OK in most cases]
+ - Version [e.g. 22]
+
+**OpenRefine (please complete the following information):**
+ - Version [e.g. OpenRefine 3.0 Beta]
+
+**Datasets**
+If you are allowed and are OK with making your data public, it would be awesome if you can include or attach the data causing the issue or a URL pointing to where the data is.
+If you are concerned about keeping your data private, ping us on our [mailing list](https://groups.google.com/forum/#!forum/openrefine)
+
+**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 OpenRefine
+
+---
+
+**Is your feature request related to a problem or area of OpenRefine? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] or, It would be easier if OpenRefine did [...]
+
+**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.