v0.5.0

MLJFlow v0.5.0

Diff since v0.4.3

• [breaking] Renaming _logging_channel to logging_channel, and changing its type from Channel{Tuple} to Union{Channel{Tuple}, Nothing}
• [breaking] open_logging_channel function now requires a Logger instance and doesn't return a Channel anymore. The reason is to keep logging_channel in a "private" form in our model
• [improvement] Removed non-useful wait!(result_channel) in src/base.jl
• [improvement] Explicitly closing the logging_channel when a result is retrieved in the background worker