[RELEASE] v0.2.1

[ravinkohli]

This PR fixes some minor bugs in v0.2.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Note that a Pull Request should only contain one of refactoring, new features or documentation changes.
Please separate these changes and send us individual PRs for each.
For more information on how to create a good pull request, please refer to The anatomy of a perfect pull request.

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

Description

This PR includes changes from

1. [FIX] Documentation and docker workflow file #449
2. [ADD] change log for release #450
3. [FIX] release docs #452
4. [FIX] ADD forecasting init design to pip data files #459
5. checks for time series dataset split #464
6. [FIX] results management and visualisation with missing test data #465
7. [FIX] pipeline options in fit_pipeline #466
8. [FIX] Numerical stability scaling for timeseries forecasting tasks #467
9. [ADD] Robustly refit models in final ensemble in parallel #471

Motivation and Context

This PR addresses recent issues raised after v0.2's release. More information about the issues can be found in the description of each of the PRs.

How has this been tested?

Each PR has successfully passed the ci checks.

[codecov]

Codecov Report

Merging #475 (17cdc09) into master (a784abb) will decrease coverage by 0.25%.
The diff coverage is 82.86%.

@@            Coverage Diff             @@
##           master     #475      +/-   ##
==========================================
- Coverage   85.53%   85.28%   -0.26%     
==========================================
  Files         231      232       +1     
  Lines       16303    16456     +153     
  Branches     3009     3048      +39     
==========================================
+ Hits        13945    14034      +89     
- Misses       1520     1573      +53     
- Partials      838      849      +11     

Impacted Files	Coverage Δ
autoPyTorch/evaluation/test_evaluator.py	94.59% <ø> (ø)
...luation/time_series_forecasting_train_evaluator.py	90.79% <ø> (ø)
autoPyTorch/evaluation/train_evaluator.py	89.06% <ø> (+1.56%)	⬆️
setup.py	0.00% <ø> (ø)
autoPyTorch/utils/results_visualizer.py	95.53% <42.85%> (-3.52%)	⬇️
...mponents/setup/network/forecasting_architecture.py	89.55% <50.00%> (-1.05%)	⬇️
...tup/traditional_ml/traditional_learner/learners.py	81.20% <66.66%> (-1.90%)	⬇️
autoPyTorch/utils/results_manager.py	95.30% <73.52%> (-3.09%)	⬇️
...ml/traditional_learner/base_traditional_learner.py	92.59% <77.77%> (-2.22%)	⬇️
autoPyTorch/api/base_task.py	82.60% <81.53%> (-1.22%)	⬇️
... and 27 more

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