Update README.md

Author: prashanthpai

README.md

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-sqlcache is an **experimental** caching middleware for `database/sql`
+sqlcache is a caching middleware for `database/sql`
 that enables existing Go programs to add caching in a declarative way.
 It leverages APIs provided by the handy [sqlmw](https://github.com/ngrok/sqlmw)
 project and is inspired from [slonik-interceptor-query-cache](https://github.com/gajus/slonik-interceptor-query-cache).