Update issue templates

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: flocke
+
+---
+
+**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/thumbnail-request.md

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+---
+name: Thumbnail request
+about: Request a new thumbnail
+title: "[Thumbnail]"
+labels: enhancement, thumbnail
+assignees: flocke, RichyHBM
+
+---
+
+Please fill in **all the information below** to help speed up the process!
+
+**Name**:
+**Website**:
+**Link to SVG or EPS image**: