Mlconjug3

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* Fixed issue 44 where Spanish gerunds were not conjugated properly.
* Updated dependencies.

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* Updated the documentation.

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* Fixed issue with package renaming.
* Fixed bug with Portuguese verbs ending in 'ar'.
* Retrained all models with scikit-learn 0.22.2.

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* Updated the pre-trained models for better accuracy (Now all models have more than 99.9% accuracy) .
* Added new utilities for model training and persistence.
* Now all training and GridSearch results are reproducible from run to run.
* Retrained all models with scikit-learn 0.22.1.
* Corrected mutliple edge cases and enlarged the test suite.

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* Updated the pre-trained models for better accuracy (Now all models have more than 99.9% accuracy) .
* Added new utilities for model training and persistence.
* Now all training and GridSearch results are reproducible from run to run.
* Updated development dependencies.

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* Updated scikit-learn dependency to 0.21.3.
* Updated other dependencies.