fix: Don't use Atom.to_string

[cheerfulstoic]

Using the recommended approach for LiveView when you need string keys which is to have a nested map: https://elixirforum.com/t/is-there-a-way-of-using-strings-for-assigns-keys/55459

Avoiding using String.to_atom because it is a security / stability problem. See: https://erlef.github.io/security-wg/secure_coding_and_deployment_hardening/atom_exhaustion

[cheerfulstoic]

(love this library, by the way. Thanks so much for it!)

[cheerfulstoic]

Oh, also, I was having trouble with the dependencies. You might want to specify jason as >= 1.3.0 instead of ~> 1.3.0 to give applications using your library the flexibility to use newer versions of jason. Also I had to use a json_diff_ex specification of >= 0.6.0 for some reason, not sure why 🤷

[cheerfulstoic]

👋 Was just coming back to this for a bit. Can I help do a bit of maintenance? I colleague was looking at wasn't able to use the library because there is a bug with older versions of json_diff and so they can't update the version in the app because this library uses ~> 0.5.3, so the dependency can't be updated to fix it

The error, by the way:

All dependencies are up to date
    error: undefined variable "package"
    │
 10 │      package: package,
    │               ^^^^^^^
    │
    └─ /Users/hernan/projects/electrofrenetic/deps/json_diff_ex/mix.exs:10:15: JsonDiffEx.Mixfile.project/0

    error: undefined variable "deps"
    │
 16 │      deps: deps]
    │            ^^^^
    │
    └─ /Users/hernan/projects/electrofrenetic/deps/json_diff_ex/mix.exs:16:12: JsonDiffEx.Mixfile.project/0