Excellent lib, just a feature request

[nebulaszlonemethi]

Hi,
first let me thank you for this one, it generates the most clever diffs among all the similar libs i checked. As an extra, it is able to apply patches.
Please consider to implement a "public" get(object, path) method that calculates JSON Pointer, so this lib will cover all basic features people need when working with JSON patches.

[caohanyang]

Hi,
I'm so glad you like our work!
The suggestions about the JSON Pointer is great, I will extend to support it in a few weeks.

Thanks for the suggestions!