Update README.md

Author: swhitty

README.md

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 [![Build](https://github.com/swhitty/IdentifiableContinuation/actions/workflows/build.yml/badge.svg)](https://github.com/swhitty/IdentifiableContinuation/actions/workflows/build.yml)
 [![Codecov](https://codecov.io/gh/swhitty/IdentifiableContinuation/graphs/badge.svg)](https://codecov.io/gh/swhitty/IdentifiableContinuation)
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 # Introduction