fixed broken github issue labels (#640)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,9 +2,7 @@
 name: Bug report
 about: Create a report to help us improve
 title: ""
-labels:
-  - bug
-  - triage
+labels: bug, triage
 assignees: ""
 ---
 

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,9 +2,7 @@
 name: Feature request
 about: Suggest an idea for this project
 title: ""
-labels:
-  - enhancement
-  - triage
+labels: enhancement, triage
 assignees: ""
 ---