Added deprecation notice

Author: aausch

README.md

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 **_Note - this library is now DEFUNCT ~~hosted at https://github.com/nftscan2022/nftscan-api-python-sdk~~ (official NftScan github is now up at https://github.com/nftscan-official)_**
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+# 🚨🚨🚨 DEPRECATED/NOT MAINTAINED 🚨🚨🚨
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 # NFTScan NFT API Python 3 wrapper
 
 A library providing Python 3 bindings for the [NFTScan API](https://developer.nftscan.com/)