modeltime.ensemble 0.4.2

Compatibility with modeltime 0.7.0.

• Calibration: Added "id" feature to enable accuracy and confidence intervals by time series ID.

Improvements (included in modeltime.ensemble 0.4.1)

• Improvements for parallel processing during refitting (available in modeltime 0.6.0).
• Requires modeltime 0.6.0 and parsnip 0.1.6 to align with xgboost upgrades.