Categorized issue types under "types:"

Based on feedback from https://github.com/e107inc/e107/issues/4054#issuecomment-571527342

.github/ISSUE_TEMPLATE/BUG_REPORT.md

@@ -2,7 +2,7 @@
 name: Bug report
 about: Create a report for a problem that shouldn't be happening
 title: ''
-labels: bug
+labels: 'type: bug'
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.md

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

.github/ISSUE_TEMPLATE/QUESTION.md

@@ -2,8 +2,9 @@
 name: Question
 about: Ask about behavior that you can't find documented anywhere
 title: ''
-labels: question
+labels: 'type: question'
 assignees: ''
+
 ---
 
 <!-- If you know that something isn't working the way it should, -->