0.6.1

• Make Neuraxle work under Windows. May error sometimes with the file lock issues at deletions / teardowns, but that is a detail and things are mostly working.
• Add python 3.9 support.
• Removed support for pickle checkpoints and kept only joblib checkpoints to simplify maintenance.
• Add vscode to gitignore.
• Little debugging and refactor of streaming pipeline for python 3.9 support.
• Usage of savers fixed in the threading and processes code after discovering the bug doing the refactor.
• API breaking change toSequentialQueuedPipeline and ParallelQueuedFeatureUnion such that use_threading changed touse_processes to be more clear.
• Some changes to the logging and to objects' print behavior due to the changes in parallelism and python version update.
• Moves the new_trial function to the base HyperparamsRepository class, thus removing duplicated code.
• Improve the implementation of str and repr in BaseStep and in the TruncableSteps.