Minor: forgot issue label

Author: treyharris

.github/ISSUE_TEMPLATE/author-bug-report.md

@@ -2,9 +2,11 @@
 name: Author bug report
 about: For contributors and developers
 title: ''
-labels: ''
+labels: bug
 assignees: ''
 
 ---
 
-<!-- This is for bugs involving the software used to build the docs. If you are experiencing an issue viewing the docs, please use another issue type. -->
+<!-- This is for bugs involving the software used to build the
+docs. If you are experiencing an issue viewing the docs, please use
+another issue type. -->