Update README.md

ajaybhargav · web-flow · commit 595d9f5cdd7c · 2020-05-30T17:16:03.000+05:30
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 # SIWISDK
 
 Software development kit for SIWI GSM modules
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+[![Documentation Status](https://readthedocs.org/projects/siwisdk/badge/?version=latest)](https://siwisdk.readthedocs.io/en/latest/?badge=latest)
