Update README.md

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metomi · Feb 20, 2017 · d0bef3b · d0bef3b
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 ===========
 
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+[![DOI](https://zenodo.org/badge/11450932.svg)](https://zenodo.org/badge/latestdoi/11450932)
 
 Python ISO 8601 full-specification parser and data model/manipulation utilities. 
 Intended to be used in a similar way to Python's datetime module.