Update reference example

No issues with React 18 detected thus far. Future tasks exists to migrate to RTL from Enzyme.

Author: jakezatecky

.github/ISSUE_TEMPLATE/bug_report.md

@@ -11,7 +11,7 @@ assignees: ''
 Please include a clear and concise description of what the bug is.
 
 **Reproduction steps**
-Please include the necessary steps to reproduce the issue as well as a live example that showcases it. You can modify this [CodeSandbox reference point](https://codesandbox.io/s/oj5wnyr7w9) to create a working example.
+Please include the necessary steps to reproduce the issue as well as a live example that showcases it. You can modify this [CodeSandbox reference point](https://codesandbox.io/s/checkboxtree-example-3e4o2l) to create a working example.
 
 **Expected behavior**
 Please include a clear and concise description of what you expected to happen.

README.md

@@ -26,8 +26,6 @@ npm install react-checkbox-tree --save
 
 > **Note** – By default, this library makes use of [Font Awesome](http://fontawesome.io/) styles and expects them to be loaded in the browser.
 
-> **Note** – Although **React 18** should work, our unit tests run against React 17 due to incompatibility with the unit testing tool (Enzyme).
-
 ### Include CSS
 
 For your convenience, the library's styles can be consumed utilizing one of the following files: