add tags to issue templates.

Author: DanielGoldfarb

.github/ISSUE_TEMPLATE/ask-a-question.md

@@ -2,7 +2,7 @@
 name: Ask a Question
 about: Question about usage, project priorities, or anything else related to mplfinance.
 title: ''
-labels: ''
+labels: 'question'
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,8 +1,8 @@
 ---
 name: Bug report
 about: Create a report to help us improve
-title: ''
-labels: ''
+title: 'Bug Report:'
+labels: 'bug'
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,8 +1,8 @@
 ---
 name: Feature request
 about: Suggest an idea for this project
-title: ''
-labels: ''
+title: 'Feature Reuest:'
+labels: 'enhancement'
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/feedback.md

@@ -1,8 +1,8 @@
 ---
 name: Feedback
 about: What do you think of mplfinance?  Pros? Cons?  Thoughts?
-title: ''
-labels: ''
+title: 'Comment:'
+labels: 'feedback'
 assignees: ''
 
 ---