v0.21.1

MLJBase v0.21.1

Diff since v0.21.0

• (bug fix) #865 @OkonSamuel

Closed issues:

• Latest release breaks MCMCDiagnosticTools (#863)
• Error when calling fallback operations for probabilistic networkcomposites (#864)

Merged pull requests:

• fix bug in fallback operations for probabilisticnetworkcomposites (#865) (@OkonSamuel)
• For a 0.21.1 release (#866) (@ablaom)