Update README.md

Author: asmyasnikov

README.md

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 [![codecov](https://codecov.io/gh/ydb-platform/ydb-go-sdk/branch/master/graph/badge.svg?precision=2)](https://app.codecov.io/gh/ydb-platform/ydb-go-sdk)
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 Supports `table`, `discovery`, `coordination`, `ratelimiter`, `scheme` and `scripting` clients for `YDB`. 
 `YDB` is an open-source Distributed SQL Database that combines high availability and scalability with strict consistency and ACID transactions.