docs(issue_template) Add note to search past issues before creating a new issue

Author: dalelotts

.github/issue_template.md

@@ -6,15 +6,21 @@ Stack Overflow: http://stackoverflow.com/search?q=angular-bootstrap-datetimepick
 **This repository's issues are reserved for feature requests and bug reports.**
 
 ### Bug Reports
-You MUST have a JSBin recreation, or else your issue will be CLOSED without explanation.
+**You MUST have a JSBin recreation of the defect or your issue will be CLOSED without explanation**
+
+**NB:** Search the existing issues (open and closed) to see if someone has already reported your bug. If so, vote with a 👍 reaction on the topmost description of the issue [(learn how)](https://github.com/blog/2119-add-reactions-to-pull-requests-issues-and-comments) and press the Subscribe button to receive updates when progress is made.
+
+Comments like "+1" or "when will this be done?" will be ignored. Only 👍 reactions on the topmost description will be counted.
+
+**Duplicate issues will be CLOSED without explanation.**
 
 Instructions: https://github.com/dalelotts/angular-bootstrap-datetimepicker/wiki/Reporting-Bugs
 
 * __Overview of the Issue__ - if an error is being thrown a non-minified stack trace helps
 * __Motivation for or Use Case__ - explain why this is a bug for you
 * __angular-bootstrap-datetimepicker Version(s)__ - is it a regression?
 * __Browsers and Operating System__ - is this a problem with all browsers or only specific ones?
-* __Link to a live example__ - provide a live example (using JSBin, Plunker or JSFiddle.
+* __Link to a live example__ (Required) - provide a live example (using JSBin, Plunker or JSFiddle.
 * __Related Issues__ - has a similar issue been reported before?
 * __Suggest a Fix__ - if you can't fix the bug yourself, perhaps you can point to what might be
   causing the problem (line of code or commit)