Update README.md

Author: lemire

README.md

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 ## Users and Related Work
 
 The fast_float library is part of:
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 fast_double_parser library is part of the [Microsoft LightGBM machine-learning
 framework](https://github.com/microsoft/LightGBM).
 
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+[![Packaging status](https://repology.org/badge/vertical-allrepos/fastfloat.svg)](https://repology.org/project/fastfloat/versions)
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 ## References
 
 * Daniel Lemire, [Number Parsing at a Gigabyte per