Update README.md

Author: diogob

README.md

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 # postgres-websockets
 
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 postgres-websockets is a [middleware](https://hackage.haskell.org/package/wai) that adds websockets capabilites on top of [PostgreSQL](https://www.postgresql.org)'s asynchronous notifications using LISTEN and NOTIFY commands.
 The project was largely inspired and originally designed for use with [PostgREST](https://github.com/begriffs/postgrest).