Update README.md

Author: yxd-hde

README.md

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 # python-lambda-local
 
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+[![wercker status](https://app.wercker.com/status/04f5bc5b7de3d5c6f13eb5b871035226/s "wercker status")](https://app.wercker.com/project/bykey/04f5bc5b7de3d5c6f13eb5b871035226)
 
 Run lambda function on local machine