Update issue templates

Author: davidrsch

.github/ISSUE_TEMPLATE/🐛-bug-report.md

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+---
+name: "\U0001F41B Bug Report"
+about: Report a bug in the package. Please include a reproducible example using the
+  reprex package.
+title: 'BUG: '
+labels: ''
+assignees: ''
+
+---
+
+** Description**
+
+Clearly describe the problem.
+
+
+**Reprex**
+
+Please include a [minimal reproducible example (reprex)](https://reprex.tidyverse.org/) below.  
+You can install it via: `install.packages("reprex")`
+
+```r
+# Paste your reprex here
+```
+
+**Session Info**
+
+Please paste the output of sessionInfo() here:
+
+```r
+sessionInfo()
+```
+
+**Expected Behavior**
+
+What did you expect to happen?
+
+**Actual Behavior**
+
+What actually happened?
+
+**Additional Context**
+
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/💡-feature-request.md

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+---
+name: "\U0001F4A1 Feature Request"
+about: Suggest an idea for this project
+title: 'Feature Request: '
+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.