Version 0.1.5
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 * min_length and max_length options for List validator


Version 0.1.4
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 * regex option for String validator


Version 0.1.3
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 * min_length and max_length options for String validator


Version 0.1.2
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 * delete_unknown parameter for DictScheme validator


Version 0.1.1
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 * min and max options for Integer validator


Version 0.1
-----------
 * Initial release with experimental and possibly unstable API
