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Added
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* Provide Kakasi.normalize(text) class method
* Add unidic data into data (not used yet), and add parse utility.
Fixed
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* Put type hint stub into package
* Copyright notifications
Changed
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* Expand all cletter into dictionary (139)
* Change primary kanwadict index from str to int
* test: gather all legacy test into test_pykakasi_legacy.py file.