Update json requirement from 0.11 to 0.12

[dependabot-preview]

Updates the requirements on json to permit the latest version.

Release notes

Sourced from json's 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<JsonValue> (closes #160).
• object! and array! macros will no longer re-allocate (closes #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).
• BREAKING HashMap and BTreeMap conversions are now more generic, working for any pair of K key and V value where K: AsRef<str> and V: Into<JsonValue>. 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

• 2a57273 Merge pull request #164 from maciejhirsz/v0.12.0
• bd429cc v0.12.0
• 14bfab1 Merge pull request #163 from matthias-t/patch-1
• aa60bef Use $crate when recursing in object! macro
• bce506a Version bump
• 1f135b7 Merge pull request #162 from mominul/master
• 5064b8d Add insert() function in JsonValue
• 677a590 chore: Minor cleanup, bump version
• 02f2df1 Merge pull request #156 from macisamuele/maci-implement-ExactSizeIterator
• da9744d Implement ExactSizeIterator for object::IterMut
• Additional commits viewable in compare view

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[leplatrem]

running 45 tests

test batch::test_record::test_add_batch_preserves_order ... 

thread 'main' has overflowed its stack

fatal runtime error: stack overflow

error: test failed, to rerun pass '--lib'

Caused by:

  process didn't exit successfully: `/home/travis/build/Kinto/kinto-http.rs/target/debug/deps/kinto_http-c23745e0b20286b3` (signal: 6, SIGABRT: process abort signal)

The command "RUST_TEST_THREADS=1 cargo test --verbose $FEATURES" exited with 101.
cache.2

store build cache