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History
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1.5.2 (2017-10-24)
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* Assig different colors to different lablels

1.5.1 (2017-9-27)
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* Show a autosaving dialog

1.5.0 (2017-9-14)
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* Fix the issues
* Add feature: Draw a box easier


1.4.3 (2017-08-09)
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* Refactor setting
* Fix the issues


1.4.0 (2017-07-07)
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* Add feature: auto saving
* Add feature: single class mode
* Fix the issues

1.3.4 (2017-07-07)
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* Fix issues and improve zoom-in

1.3.3 (2017-05-31)
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* Fix issues

1.3.2 (2017-05-18)
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* Fix issues


1.3.1 (2017-05-11)
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* Fix issues

1.3.0 (2017-04-22)
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* Fix issues
* Add difficult tag
* Create new files for pypi

1.2.3 (2017-04-22)
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* Fix issues

1.2.2 (2017-01-09)
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* Fix issues