Merge pull request #151 from Carreau/landscape

Add landscape.io badge

Author: minrk

README.md

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 # Jupyter Client
 
+[![Code Health](https://landscape.io/github/jupyter/jupyter_client/master/landscape.svg?style=flat)](https://landscape.io/github/jupyter/jupyter_client/master)
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 `jupyter_client` contains the reference implementation of the [Jupyter protocol][].
 It also provides client and kernel management APIs for working with kernels.