Update README.md

Hoanvn1734 · Jul 13, 2017 · a6b5cb3 · a6b5cb3
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 IoT-related research and framework prototypes
 
 ### Architecture concept
-![Concept](https://github.com/huanpc/IoT-1/blob/master/doc_specific/concept_2.jpg)
+![Concept](architecture/architecture_3.png)