Vulnerability patch

Details outlined here: #85. TLDR: The prototype of the returned diff object could be polluted but not globally on all objects.

Fix: #87

Thanks @Retr02332 for highlighting the issue and validating the fix.

This vulnerability was introduced in https://github.com/mattphillips/deep-object-diff/releases/tag/v1.1.6

Contributors

• @Retr02332