Update issue templates (#158)

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,31 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: 'Bug: Helpful but short description'
+labels: ''
+assignees: ''
+
+---
+
+**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
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Python and WOMBAT Version**
+ - Python 3.x
+ - Result of `wombat.__version__`
+
+**Additional context**
+Add any other context about the problem here.