update Flask version on README.md
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**A simple self-hosted workout/activity tracker.**  
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[](https://python.org)
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[](http://flask.pocoo.org/) 
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[](http://flask.pocoo.org/) 
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[](https://reactjs.org/)  
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[](https://www.codacy.com/app/SamR1/FitTrackee)
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[](https://www.codacy.com/app/SamR1/FitTrackee)<sup><sup>1</sup></sup>
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