v0.19.5

MLJ v0.19.5

Diff since v0.19.4

• Correct problem with previous version in which some methods were not exported, namely: source, node, fit!, freeze!, thaw!, Node, sources, origins (#1043) @pebeto

Closed issues:

• Is the Averager documentation deprecated? (#1039)

Merged pull requests:

• Adding necessary exports (#1043) (@pebeto)
• For a 0.19.5 release (#1044) (@ablaom)