fix: use better runkit.com example in CONTRIBUTING.md (#63)

Author: gr2m

lib/create-contributing.js

@@ -16,7 +16,7 @@ By participating in this project you agree to abide by its terms.
 Before you create a new Issue:
 
 1. Please make sure there is no [open issue](https://github.com/${owner}/${repo}/issues?utf8=%E2%9C%93&q=is%3Aissue) yet.
-2. If it is a bug report, include the steps to reproduce the issue and please create a reproducible test case on [runkit.com](https://runkit.com/). Example: https://runkit.com/gr2m/5aa034f1440b420012a6eebf
+2. If it is a bug report, include the steps to reproduce the issue and please create a reproducible test case on [runkit.com](https://runkit.com/). Example: https://runkit.com/gr2m/octokit-rest-js-1808
 3. If it is a feature request, please share the motivation for the new feature, what alternatives you tried, and how you would implement it.
 4. Please include links to the corresponding github documentation.