chore(github): update issue template to include stackblitz

Author: brandyscarney

.github/ISSUE_TEMPLATE/bug_report.md

@@ -37,6 +37,7 @@ assignees: ''
 A sample application via GitHub
 
 StackBlitz (https://stackblitz.com)
+Ionic Angular StackBlitz: https://stackblitz.com/edit/ionic-v4-angular-tabs
 
 Plunker (http://plnkr.co/edit/cpeRJs?p=preview)