Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: garrynewman
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Set x to y
+2. Run for x minutes
+3. Call x
+4. See error
+
+**Calling Code**
+```
+// The code you're using to call into Steamworks
+Steamworks.DoBug();
+```
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS]
+- Unity: [e.g Unity 2019.3]
+
+**Additional context**
+Add any other context about the problem here.