default labels per ISSUE_TEMPLATE type

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,7 +1,7 @@
 ---
 name: Bug Report
 about: You're experiencing an issue with Packer that is different than the documented behavior.
-
+labels: bug
 ---
 
 When filing a bug, please include the following headings if possible. Any

.github/ISSUE_TEMPLATE/feature_requests.md

@@ -1,7 +1,7 @@
 ---
 name: Feature Request
 about: If you have something you think Packer could improve or add support for.
-
+labels: enhancement
 ---
 
 Please search the existing issues for relevant feature requests, and use the

.github/ISSUE_TEMPLATE/question.md

@@ -1,7 +1,7 @@
 ---
 name: Question
 about: If you have a question, please check out our other community resources instead of opening an issue.
-
+labels: question
 ---
 
 Issues on GitHub are intended to be related to bugs or feature requests, so we