Update issue templates

Author: dhardy

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Summary**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+```rust
+// Sample code
+```
+
+**Expansion**
+```rust
+// Result of 'cargo expand', if available
+// To install:
+// cargo install cargo-expand
+```
+
+**Additional information**
+Expected result, suggested error message or other details

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Summary**
+Concise description of problem
+
+**Sample code**
+```rust
+// Sample code showing context and suggested macro syntax
+```
+
+**Expansion**
+```rust
+// Result of macro expansion for the above sample.
+```
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/other.md

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+---
+name: Other
+about: Blank issue
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+