Bump log from 0.4.7 to 0.4.12 in /rust

[dependabot-preview]

Bumps log from 0.4.7 to 0.4.12.

Changelog

Sourced from log's changelog.

[0.4.12] - 2020-12-24

New

• Support platforms without atomics by racing instead of failing to compile
• Implement Log for Box<T: Log>
• Update cfg-if to 1.0
• Internal reworks of the structured logging API. Removed the Fill API and added source::as_map and source::as_list to easily serialize a Source as either a map of {key: value, ..} or as a list of [(key, value), ..].

Fixed

• Fixed deserialization of LevelFilter to use their u64 index variants

[0.4.11] - 2020-07-09

New

• Support coercing structured values into concrete types.
• Reference the win_dbg_logger in the readme.

Fixed

• Updates a few deprecated items used internally.
• Fixed issues in docs and expands sections.
• Show the correct build badge in the readme.
• Fix up a possible inference breakage with structured value errors.
• Respect formatting flags in structured value formatting.

[0.4.10] - 2019-12-16 (yanked)

Fixed

• Fixed the log! macros so they work in expression context (this regressed in 0.4.9, which has been yanked).

[0.4.9] - 2019-12-12 (yanked)

Minimum Supported Rust Version

This release bumps the minimum compiler version to 1.31.0. This was mainly needed for cfg-if, but between 1.16.0 and 1.31.0 there are a lot of language and library improvements we now take advantage of.

New

• Unstable support for capturing key-value pairs in a record using the log! macros

Improved

Commits

• 746e6e2 Merge pull request #429 from KodrAus/cargo/0.4.12
• 4c66a1c prepare for 0.4.12 release
• 0e78c11 Run tests in our MSRV (#427)
• 03b6989 Merge pull request #422 from Aaron1011/fix/semi
• c4ed87c Merge pull request #426 from KodrAus/feat/kv-downcast
• 960ef82 add adapters for serializing Sources
• e999195 expose downcasting on Value
• 078e68f Merge pull request #423 from KodrAus/feat/value-bag
• 71d6ed3 add serde support to Value
• c6be245 simplify ToValue impl for str
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #211.