Set bug or feature label depending on issue template

Signed-off-by: Alexander Trost <galexrt@googlemail.com>

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,6 +1,7 @@
 ---
 name: Bug report
 about: Create a report to help us improve
+labels: bug
 ---
 <!-- **Are you in the right place?**
 1. For issues or feature requests, please create an issue in this repository.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,6 +1,7 @@
 ---
 name: Feature request
 about: Suggest an idea/feature for this project
+labels: feature
 ---
 <!-- **Are you in the right place?**
 1. For issues or feature requests, please create an issue in this repository.