Update labels in issue templates (#986)

* Update label on bug template

* Update label on feature request template

Author: fcollonval

.github/ISSUE_TEMPLATE/bug_report.md

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

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,7 +2,7 @@
 name: Feature request
 about: Suggest an idea for this project
 title: ''
-labels: type:Enhancement
+labels: enhancement
 assignees: ''
 
 ---