Bump log from 0.3.6 to 0.4.7

[dependabot-preview]

Bumps log from 0.3.6 to 0.4.7.

Release notes

Sourced from log's releases.

env_logger-0.4.3

• Make log target configurable (#105, thanks @​dbrgn)

env_logger-0.4.2

No release notes provided.

env_logger-0.4.1

No release notes provided.

env_logger-0.4.0

No release notes provided.

Changelog

Sourced from log's changelog.

[0.4.7] - 2019-07-06

New

• Support for embedded environments with thread-unsafe initialization.
• Initial unstable support for capturing structured data under the kv_unstable
  feature gate. This new API doesn't affect existing users and may change in future
  patches (so those changes may not appear in the changelog until it stabilizes).

Improved

• Docs for using log with the 2018 edition.
• Error messages for macros missing arguments.

[0.4.6] - 2018-10-27

Improved

• Support 2018-style macro import for the log_enabled! macro.

[0.4.5] - 2018-09-03

Improved

• Make log's internal helper macros less likely to conflict with user-defined
  macros.

[0.4.4] - 2018-08-17

Improved

• Support 2018-style imports of the log macros.

[0.4.3] - 2018-06-29

Improved

• More code generation improvements.

[0.4.2] - 2018-06-05

Improved

• Log invocations now generate less code.

Fixed

• Example Logger implementations now properly set the max log level.

[0.4.1] - 2017-12-30

... (truncated)

Commits

• be6980d Merge pull request #340 from KodrAus/cargo/0.4.7
• 8075b69 include kv_unstable feature in docs.rs
• af18452 prepare for 0.4.7 release
• 9b71d36 Make it easier to create a Value from owned or erased external types (#339)
• a764fda Merge pull request #338 from dereckson/clean-duplicate-in-readme-for-rust-2018
• d85209f Merge pull request #337 from tmccombs/std-kv-sources
• bcbee9f Merge pull request #336 from tmccombs/kv-error
• aa796fb Remove duplicate Rust 2018 documentation
• 86748c8 Fix error with rustc 1.21
• 506167c Add impls for Source for HashMap and BTreeMap
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #14.