v0.19.4

MLJBase v0.19.4

Diff since v0.19.3

• Drop support for julia < 1.6
• Add doc strings to built-in measure instances #719
• Programatically re-export all measure types, aliases and instances #720

Closed issues:

• Fail to precompile (#715)
• documentation of log_loss/LogLoss (#716)
• Bind measure doc-string to all aliases (#717)
• Programmatically re-export all measures (#718)

Merged pull requests:

• Add docstrings for instances (aliases) of docstrings (#719) (@ablaom)
• Programmatically export measure types, type aliases, and built-in instances (#720) (@ablaom)
• For a 0.19.4 release (#721) (@ablaom)