Switch CDN to unpkg

Author: mistic100

.github/ISSUE_TEMPLATE.md

@@ -3,4 +3,4 @@
 - Please search in the [documentation](http://querybuilder.js.org) before asking.
 - Any issue without enough details won't get any answer and will be closed.
 - Help requests must be exhaustive, precise and come with some code explaining the need (use Markdown code highlight).
-- Bug reports must come with a simple test case, preferably on jsFiddle, Plunker, etc. (QueryBuilder is available on [jsDelivr](https://www.jsdelivr.com/projects/jquery.query-builder) to be used on such platforms).
+- Bug reports must come with a simple test case, preferably on jsFiddle, Plunker, etc. (QueryBuilder is available on [unpkg](https://unpkg.com/jQuery-QueryBuilder/dist/) to be used on such platforms).