docs: add steps to reproduce section to template (#6443)

* add new steps to reproduce section to github issue template to ask
issue filers to provide explicit steps to reproduce the issue so people
aren't left to guess or parse poorly written ones.

Author: icfantv

.github/ISSUE_TEMPLATE.md

@@ -6,6 +6,8 @@ existing issues (both open and closed) prior to opening any new issue and ensure
 
 ### Link to minimally-working plunker that reproduces the issue:
 
+### Steps to reproduce the issue:
+
 ### Version of Angular, UIBS, and Bootstrap
 
 Angular: