Bump flexi_logger from 0.14.3 to 0.15.12

[dependabot-preview]

Bumps flexi_logger from 0.14.3 to 0.15.12.

Changelog

Sourced from flexi_logger's changelog.

[0.15.12] - 2020-08-07

Make 1.37.0 the minimal rust version for flexi_logger.

[0.15.11] - 2020-08-07

Introduce feature specfile_without_notification to allow coping with OS issues (see issue-59).

[0.15.10] - 2020-07-22

Minor code maintenance.

[0.15.9] - 2020-07-21

Allow using the log target with fantasy names, like with env_logger. Closes issue-56.

[0.15.8] - 2020-07-20

Allow modifying the coloring palette through the environment variable FLEXI_LOGGER_PALETTE. See function style for details. Closes issue-55.

By default, don't use colors if stdout or stderr are not a terminal (issue-57).

Add variant Criterion::AgeOrSize (kudos to pscott, PR-54).

[0.15.7] - 2020-07-02

Add some Debug derives (kudos to pscott, PR-52).

[0.15.6] - 2020-07-02

Introduce separate formatting for stdout (kudos to pscott, PR-51).

Deprecate Logger::do_not_log().

[0.15.5] - 2020-06-18

Commits

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[dependabot-preview]

Superseded by #51.