Update issue templates

Author: soimkim

.github/ISSUE_TEMPLATE/bug_report.md

@@ -3,7 +3,7 @@ name: Bug report
 about: Create a report to help us improve
 title: ''
 labels: bug
-assignees: soimkim
+assignees: ''
 
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@@ -17,8 +17,8 @@ Steps to reproduce the behavior:
 A clear and concise description of what you expected to happen.
 
 **System environment (please complete the following information):**
- - OS: [e.g. Ubuntu 16.04, Windows, Mac OS]
- - Python : [e.g. python3.7]
+- OS: [e.g. Ubuntu 16.04, Windows, Mac OS]
+- Python : [e.g. python3.7]
 
 **Additional context**
 Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -3,7 +3,7 @@ name: Feature request
 about: Suggest an idea for this project
 title: ''
 labels: enhancement
-assignees: soimkim
+assignees: ''
 
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