Update README.md

Author: zziz

README.md

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 | [2018](#2018) | [2017](#2017) | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | [![Tweet](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/intent/tweet?text=Papers%20with%20code.%20Sorted%20by%20stars.%20Updated%20weekly.%20&url=https://github.com/zziz/pwc&via=fvzaur&hashtags=machinelearning,paper,code,github) | [Suggestions](https://github.com/zziz/pwc/issues/1) |    
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 This work is in continuous progress and update. More of PWC is coming 🔜🚧🛠️✏️🎨🚀💡
 
 ## 2018