Update C++ badge in README.md
Change-Id: I776fbdf1438b68ef8eb35ab00fa0015209b89c9c
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[](https://github.com/named-data/ChronoSync/actions/workflows/ci.yml)
[](https://github.com/named-data/ChronoSync/actions/workflows/docs.yml)
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+

> DEPRECATION NOTICE: ChronoSync's design is outdated. We recommend using more recent sync protocols, such as [PSync](https://named-data.net/doc/PSync/current/index.html) or [StateVectorSync](https://named-data.github.io/StateVectorSync/).