Ignore case is not exposed

[nickerzb]

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JSDiff supports ignoring case for the diffChars and diffWords.

https://github.com/kpdecker/jsdiff/tree/v4.0.1#api

As a consumer of this library, I should be able to decide if I want case sensitive comparing. Right now for example, I get the following diff:

This function call would have to change in order to accomodate this option.