Bump json from 0.11.15 to 0.12.0

[dependabot-preview[bot]]

Bumps json from 0.11.15 to 0.12.0.

Release notes

*Sourced from [json's releases](https://github.com/maciejhirsz/json-rust/releases).* > ## 0.12.0 > + Updated to edition 2018. > + Simplified reading escaped unicode in strings a bit. > + Provided `From<&[T]>` implementation for `JsonValue` where `T: Into` (closes [#160](https://github-redirect.dependabot.com/maciejhirsz/json-rust/issues/160)). > + `object!` and `array!` macros will no longer re-allocate (closes [#159](https://github-redirect.dependabot.com/maciejhirsz/json-rust/issues/159)). > + `object!` and `array!` macros can be now used without being imported into local scope (by using `json::object!` or `json::array!`, thanks [@​matthias-t](https://github.com/matthias-t)). > + **BREAKING** `HashMap` and `BTreeMap` conversions are now more generic, working for any pair of `K` key and `V` value where `K: AsRef` and `V: Into`. This means that type inference won't always work in your favor, but should be much more flexible. > + You can now `.collect()` an interator of `(K, V)` (with bounds same as point above) into an `Object`.

Commits

- See full diff in [compare view](https://github.com/maciejhirsz/json-rust/commits/v0.12.0)

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Dependabot will merge this PR once CI passes on it, as requested by @Aloxaf.

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[Aloxaf]

@dependabot squash and merge