Bump flexi_logger from 0.16.3 to 0.17.1

[dependabot]

Bumps flexi_logger from 0.16.3 to 0.17.1.

Changelog

Sourced from flexi_logger's changelog.

[0.17.1] - 2021-01-14

Add options Logger::buffer_and_flush() and buffer_and_flush_with() as means to avoid long output delays.

[0.17.0] - 2021-01-08

Introduce optional buffering of log output. This increases performance (which can be relevant for programs with really high log production), but delays log line appearance in the output, which can be confusing, and requires to flush or shutdown the logger at the end of the program to ensure that all logs are written to the output before the program terminates.

Reduce the size of LogConfiguration considerably by moving the optional and rarely used textfilter into the heap. This unfortunately leads to an incompatible change in a rarely used public method (LogConfiguration::text_filter() was returning a &Option<Regex>, and is now returning Option<&Regex>), which enforces a version bump.

Rename ReconfigurationHandle to LoggerHandle (and add an type alias with the old name).

Add the public method LoggerHandle::flush().

Expose DeferredNow::new().

Add some must_use annotations where appropriate.

[0.16.2] - 2020-11-18

Add module code-examples with additional usage documentation. This is a follow-up of a PR, kudos goes to devzbysiu!

[0.16.1] - 2020-09-20

Support empty toml spec files (kudos to ijackson for pull request 66!) (was supposed to be part of 0.16.0, but I had forgotten to merge it).

[0.16.0] - 2020-09-19

If file logging is used, do not create the output file if no log is written. Solves issue-62.

Improve color handling

• introduce AdaptiveFormat for a clearer API
• Support using feature atty without provided coloring
• Extend example colors to provide insight in how AdaptiveFormat works

... (truncated)

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