Update README.md

Author: estivensh

README.md

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-* [AWS - S3](https://github.com/estivensh4/aws-kmp) - AWSS3 is an AWS extension for KMP.
+* [AWS - S3](https://github.com/estivensh4/aws-kmp) - AWS KMP is an extension to AWS Kotlin Multiplatform for JVM, Android and iOS.
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