TRIVIAL: Update of the README.md

Author: marazt

README.md

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+<img src="logo.png" align="left" style="width:128px; margin-right: 20px;" />
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 # Object Mapper
 
 **Version**
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 The MIT License (MIT)
 
 **Last updated**
-03 November 2017
+21 February 2018
 
 **Package Download**
 https://pypi.python.org/pypi/object-mapper