Merge pull request #2632 from kernc/basket-fix

Basket term summation

Author: janezd

.github/ISSUE_TEMPLATE.md

@@ -4,6 +4,10 @@ sections below.
 
 Wrap code and verbatim terminal window output into triple backticks, see:
 https://help.github.com/articles/basic-writing-and-formatting-syntax/#quoting-code
+
+If you're raising an issue about an add-on (e.g. installed via
+Options > Add-ons), raise an issue on the relevant add-on's issue
+tracker instead. See: https://github.com/biolab?q=orange3
 -->
 
 ##### Orange version