Pyjsonpatch

What's Changed
* perf: Add a check using `is` instead of just `==` by mofojed in https://github.com/deephaven/pyjsonpatch/pull/4

**Full Changelog**: https://github.com/deephaven/pyjsonpatch/compare/v0.1.2...v0.1.3

No functional changes. Updated README and metadata.

pyjsonpatch

A Python implementation of JSON Pointer ([RFC 6902](https://datatracker.ietf.org/doc/html/rfc6901)) and JSON Patch ([RFC 6902](https://datatracker.ietf.org/doc/html/rfc6902)). Primarily, the package can do the following to Python object(s) representing JSON(s):
- `apply_patch` to modify an object with a JSON patch
- `generate_patch` to generate a JSON Patch from two objects
- `get_by_ptr` to retrieve a value from object using a JSON pointer